Application Programming Interface


An Application Programming Interface (API) is a set of rules and protocols for building and interacting with software applications. It specifies how different software components should interact, allowing diverse software systems to communicate with each other. APIs enable the functionalities of one program to be used in another, promoting software efficiency and interoperability.


The phonetics of “Application Programming Interface” are: æp-lɪ-‘keɪ-ʃən proʊ-‘græ-mɪŋ ˈɪn-tər-feɪs.

Key Takeaways

  1. Communication Bridge: An Application Programming Interface (API) serves as a communication bridge between different software applications. It allows different pieces of software to communicate with each other without knowing how they’re implemented.
  2. Efficiency: APIs increase efficiency in development by providing predefined functions that developers can leverage to build applications more swiftly and efficiently.
  3. Data Exchange: APIs enable the extraction and exchange of data from one software application to another. This feature is critical for maintaining the flow of information between systems and enabling integration between different software tools.


The term “Application Programming Interface” or API is important because it allows different software applications to interact with each other, enabling the sharing of data and functionalities. APIs serve as a set of rules and protocols that specifies how software components should interact, acting as a bridge between different software applications. This is crucial for the development of complex software systems, as it provides developers with the ability to integrate and leverage existing software components, enabling faster development, increased efficiency, and enhanced interoperability. APIs have also greatly facilitated the creation of the digital ecosystems we see today, where diverse applications can work together seamlessly.


An Application Programming Interface (API) serves as a communicator and facilitator between different software applications. Its fundamental purpose is to enable unrelated software systems to interact and share data with each other, providing a set of rules that these systems must adhere to. Essentially, APIs act as a bridge, allowing for the seamless flow of operations in an integral, yet hidden, manner. They allow developers to use certain features of a program without having to delve deep into its every mechanism, making it easier for different applications to work together and creating efficiencies by eliminating the need to ‘reinvent the wheel’ for every new application.Furthermore, APIs have a wide range of practical applications and are used in almost all types of software applications. For example, when you use an app like Facebook, the app uses an API to send your data to its servers, which then send back data to be displayed on your screen. In another scenario, when you are purchasing a product from an online store and opt to pay using a system like PayPal, the store’s website interacts with the PayPal API to provide a seamless transaction process. Essentially, APIs are the threads that connect the vast web of software applications and platforms that make our digital lives possible.


1. Social Media APIs: Facebook’s API, for instance, allows third-party applications to interact with Facebook’s platform. This could mean letting you post an update from a third party app, like Hootsuite, directly to your Facebook page, or access Facebook friends’ list for a game app.2. Google Maps API: Many websites and applications use Google Maps’ API to embed Google Maps on their webpage. The API allows these third-party systems to utilize Google’s map and location technology, providing the same experience to users directly on their own website or application.3. Payment Gateway APIs: Payment processors like Stripe or PayPal offer APIs for e-commerce sites to integrate these payment gateways onto their platforms. This API allows third party websites to process payments, handle transactions and send necessary information back and forth securely between the payment platform and the retailer’s site.

Frequently Asked Questions(FAQ)

**Q: What is an Application Programming Interface (API)?**A: An Application Programming Interface (API) is a set of protocols, tools, and definitions that allow different software applications to communicate with each other. It defines methods for a certain software application to interact with others, request services, and exchange data.**Q: How does an API work?**A: An API works as a middleman between different software applications. When an application needs to request certain functions or data from another application or service, it sends a request via the API. The API processes the request and communicates with the other application. The result is then sent back through the API.**Q: What are some common uses of APIs?**A: APIs are widely used for various purposes. They are used in creating web-based applications, enabling software to interact with cloud services, integrating with social media platforms like Facebook and Twitter, and more. **Q: Are there different types of APIs?**A: Yes, there are several different types of APIs. This includes Web APIs, Operating Systems APIs, Database APIs and more. Each type of API has its own sets of rules and is used in different scenarios.**Q: What is an API key?**A: An API key is a code that is passed in by computer applications. The program or server checks the key’s authorization and depending on its coded permissions, it allows or denies the request for access. **Q: Do I need to know how to code to use an API?**A: Although not all API use requires a background in coding, to fully utilize APIs and create more complex functionalities, knowledge in programming is necessary. This is primarily because APIs are built for applications to communicate with each other, which often requires understanding and writing compatible code.**Q: How is API security important?**A: Since APIs are used to exchanging data, including sensitive information between applications, its security is vital. An insecure API can lead to unauthorized access or leaks of confidential data. Therefore, proper authentication measures like API keys and OAuth tokens are typically implemented to ensure that only authorized requests go through.

Related Technology Terms

  • Endpoint
  • Requests
  • HTTP Methods
  • JSON (JavaScript Object Notation)
  • API key

Sources for More Information


About The Authors

The DevX Technology Glossary is reviewed by technology experts and writers from our community. Terms and definitions continue to go under updates to stay relevant and up-to-date. These experts help us maintain the almost 10,000+ technology terms on DevX. Our reviewers have a strong technical background in software development, engineering, and startup businesses. They are experts with real-world experience working in the tech industry and academia.

See our full expert review panel.

These experts include:


About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

More Technology Terms

Technology Glossary

Table of Contents