Burp Suite is a suite of security testing tools used for penetration testing web applications. It is developed by PortSwigger and includes tools like Burp Proxy, Burp Intruder, Burp Spider, Burp Repeater, and Burp Scanner. Burp Proxy is used for intercepting and analyzing HTTP/S requests and responses. Burp Intruder is used for automating attack scenarios like brute forcing and fuzzing. Burp Spider automates crawling of web applications to map application structure and discover URLs and parameters. Burp Repeater is used for manually modifying and replaying HTTP requests. Burp Scanner automates vulnerability scanning of web applications to identify security issues.