Much of the foundation of the software as a service (SaaS) segment of the tech industry is built upon the Linux kernel, the Apache web server, the MySQL database, and either Perl, PHP, or Python. In practice, the ‘P’ in LAMP could stand for Programming language. Over time, some of the other letters in the acronym changed with people’s technical biases (my own included). Some people replaced Linux with FreeBSD. Other people preferred Nginx’s speed and easier configuration over Apache. And many people felt that PostgreSQL prioritized correctness and protection of data more than MySQL.
No matter the change in components, the fundamentals of the LAMP stack architecture have stood the test of time pretty well.