LEMP is a software stack that includes Linux, Nginx, MySQL (or MariaDB), and PHP, offering a powerful and efficient environment for web servers. On Ubuntu 20.04, Nginx serves as the high-performance web server, while MySQL or MariaDB handle the database management. PHP is used for dynamic content processing in web applications. This combination is perfect for hosting websites with high traffic due to its speed and scalability. LEMP on Ubuntu 20.04 provides a robust, secure, and scalable solution for both production and development environments.