API Definition :
Application Programming Interface, It’s like a broker or intersection of certain software that helps in creating a chain of call requests for fetching data from one software to another. API basically uses the API Key for fetching such data. API is usually related to the software library, library means a set of rules or predefined function by which we can able to access data.
API is a set of protocols that are used to integrate the application software. API can make your call more secure within or outside the system. That means the product that uses the API to authenticate the device to access the data from the backend system or server. APIs simplify the work of the developer to integrate new application components into the existing system architecture.
For Example, In the college system, after the exam is held the answer sheet will be checked but there are different subjects assign to different teachers respectively. If teachers want to access the database we can assign the API key to different types of subjects like API Key1 for ES, API key for Compiler so on. API help to make it easier to use the system data and manage the system over a cloud or with native applications.
API Approaches :
- Private: We use the private method where we want to use individually or internally as personal work.
- Partner: This approach is used to working within organizations as the group shared, by which we can share the work with some group of people for their development work.
- Public: This type of API is made for everyone, they can use it publicly, e.g Air quality index API which can be used by anyone with their API.