API Security refers to the measures and practices used to protect Application Programming Interfaces (APIs) from malicious attacks and unauthorized access. APIs allow different software applications to communicate with each other, making them essential for modern web services. Ensuring their security helps prevent data breaches and protects sensitive information. To achieve API Security, developers implement various techniques such as authentication, encryption, and rate limiting. Authentication verifies the identity of users or systems accessing the API, while encryption secures data during transmission. Rate limiting controls the number of requests a user can make, helping to prevent abuse and maintain service availability.