REST Client is like a messenger that helps applications talk to a server that provides a RESTful API. It handles tasks such as sending requests for data, updating resources, creating new records, or deleting existing ones. Imagine you need to retrieve information from a remote server or update data in a database. REST clients act as intermediaries, helping your application send requests to the server and receive responses back.

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In today's digital world, where systems need to work together smoothly and communicate effectively, two important terms come into play, APIs and web services. These are the tools that help different applications and systems connect with each other seamlessly. APIs are like secret keys that unlock specific functions and data, saving time for developers and allowing them to reuse code.