Description: Web service security refers to a set of practices and technologies designed to protect applications and services that communicate over the web. This includes protecting data in transit and at rest, user authentication, access authorization, and information integrity. Public Key Infrastructure (PKI) is fundamental in this context, as it enables data encryption and identity verification through digital certificates. Identity and Access Management (IAM) complements these measures by ensuring that only authorized users can access certain resources, using methods such as multi-factor authentication and role-based access control. Web service security is crucial in a world where cyber threats are increasingly sophisticated, and its proper implementation can prevent data breaches and malicious attacks, ensuring user trust and the integrity of online transactions.