What is Spring Security?

Spring Security is a powerful and highly customizable authentication and authorization framework. It provides comprehensive security services for Java applications, particularly those built with the Spring Framework. It is commonly used to secure web applications, REST APIs, and other types of applications by providing features like authentication (verifying user identity), authorization (granting access to resources), protection against common attacks (e.g., CSRF, session fixation), and integration with various authentication providers (e.g., LDAP, OAuth2).