Last updated: 28 July 2026.
Quick answer. An API (Application Programming Interface) is a set of definitions and protocols that lets one application expose its data and functionality to others. It differs from an app — a complete piece of software running on a device — and from a website, a collection of web pages accessed over the internet: the API is the interface connecting them. Their rise is driven by growing application complexity, cloud adoption and microservices architecture, in which small autonomous services communicate through APIs. Integration typically involves obtaining an API key, studying the provider’s documentation, making requests and processing the JSON or XML response.
What is an API?
An API (Application Programming Interface) is a set of definitions and protocols that allow software developers to create applications that communicate with other applications. APIs are used to expose the data and functionality of an application to other applications, allowing developers to create more complex and powerful applications.
How is it different from a PPP?
An APP, or application, is software that runs on an electronic device, such as a smartphone, tablet or computer. APPs can be anything from games and social networking to productivity and finance apps.
The main difference between an API and an APP is that an API is an interface, while an APP is a complete application. An API exposes the data and functionality of an application to other applications, whereas an APP is an application that runs on an electronic device.
How is it different from a website?
A website is a collection of web pages that are hosted on a server and can be accessed via the Internet. Websites can be anything from informational sites to online shops.
The main difference between an API and a website is that an API is an interface, while a website is a set of web pages. An API exposes the data and functionality of an application to other applications, while a web is a set of web pages that can be accessed over the Internet.
What is the reason for the rise of APIs?
The rise of APIs is driven by the growing need to integrate systems and applications to improve the efficiency and functionality of digital platforms. APIs allow companies to expand their services, improve user experience and increase interoperability between different systems and platforms.
In addition, APIs facilitate the creation of new applications by allowing developers to use the functionality of other platforms, which drives innovation and the creation of new technological solutions.
The rise of APIs is due to a number of factors, including:
- Increasing complexity of applications: Modern applications are increasingly complex and require the integration of data and functionality from different sources. APIs facilitate this integration.
- Cloud adoption: The cloud has made it easier to develop and deploy APIs. Companies can use the cloud to create APIs and make them accessible to developers worldwide.
- The growing popularity of microservices: Microservices are a software architecture that divides an application into a series of small, autonomous services. APIs are an efficient way to communicate these services with each other.
APIs are transforming the way applications are developed and used. They enable developers to create more complex and powerful applications, and facilitate the integration of data and functionality from different sources.
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What are the most widely used APIs on the market and what do they include?
The most commonly used APIs in the market include:
- Google Maps API: Allows developers to integrate custom maps, routes and places into their applications.
- YouTube API: Provides access to YouTube data and functionality, allowing developers to create applications that integrate with the YouTube platform.
- Amazon API: Provides access to a variety of Amazon services and functionality, allowing developers to create applications that integrate with the Amazon platform.
- Facebook Graph API: Allows developers to access Facebook data and create applications that integrate with the Facebook platform.
- PayPal API: One of the most widely used payment APIs, with more than 220 million active accounts worldwide.
How to integrate an API into a web application?
To integrate an API into a web application, the following steps can be taken:
- Obtain an API key: Many APIs require an authentication key for use. This key is obtained by registering with the service providing the API.
- Read the API documentation: It is important to understand how the API works, what endpoints it offers and what kind of data can be obtained through it. The documentation provided by the API provider is crucial to understand how the API works.
- Making the API request: Using the API key and following the specifications in the documentation, API requests can be made to obtain the necessary data.
- Process the response: Once the API response is received, the data needs to be processed to integrate it into the web application. This may involve parsing the response in JSON or XML format, as specified by the API.
- Implement the functionality in the web application: Once the API data has been obtained and processed, it can be used to display relevant information or enable specific functionalities in the web application.
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Frequently asked questions
An API (Application Programming Interface) is a set of definitions and protocols that allows software developers to build applications that communicate with other applications. APIs expose the data and functionality of one application to others, enabling developers to create more complex and powerful digital products.
An app is a complete piece of software that runs on an electronic device such as a smartphone, tablet or computer. An API, by contrast, is not an application but an interface: it exposes an application’s data and functionality so that other applications can use them.
A website is a collection of web pages hosted on a server and accessed via the internet, ranging from informational sites to online shops. An API is an interface rather than a set of pages: it makes an application’s data and functionality available to other applications, not directly to human visitors.
Three factors drive their rise: modern applications are increasingly complex and need to integrate data from multiple sources; cloud computing has made APIs easier to develop, deploy and make accessible worldwide; and microservices architecture — dividing an application into small autonomous services — relies on APIs for those services to communicate. APIs also improve interoperability and user experience across platforms.
The usual steps are: obtain an API key by registering with the provider, since many APIs require authentication; read the provider’s documentation to understand the available endpoints and data; make the API requests following those specifications; process the response, typically in JSON or XML format; and implement the retrieved data or functionality within the web application.
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