1. API (Application Programming Interface):

   • An API is a software interface that enables communication between two systems.
   • It provides a set of code transformations available in one system for use by another system.
   • APIs can be added as programming messages, facilitating control and data exchange between systems.

2. Web Service:

   • A Web Service is a type of API that utilizes services hosted on the internet or available on a network.
   • Web Services use various protocols such as SOAP (Simple Object Access Protocol) or REST (Representational State Transfer).
   • Web Services are used to communicate with other applications or systems, sharing data and performing other operations.

Features

APIs have key elements and unique features that help different programs work well together. These features include:

• List of Rules and Guidelines: APs have a set of rules and protocols that explain how different programs should interact with each other. These rules ensure that communication between programs is clear and consistent.
• Endpoints: Endpoints are like the entry points in the API. They tell the programs where and how to ask for information or send data.
• Methods: APIs have commands that the programs can use to communicate with other programs. Some examples are:
• GET - To request data
• POST -To send new data
• PUT - To update data
• DELETE - To remove data

• Parameters: Parameters are bits of information that a program can include in its requests. They help the API understand what the program is searching for.
• Authentication: APIs need special codes or keys to ensure that only authorized data access the data. It keeps the data secure and ensures that only authorized people can use it.
• Responses: Whenever a program requests an API, it sends back a response. This response includes the information that the program requested.