The provided Bash script automates the installation and configuration of a web development environment on an Ubuntu system. The script sequentially installs and sets up Nginx, PHP-FPM, PHP Composer, and PostgreSQL. It configures PostgreSQL to listen on all addresses, creates a PostgreSQL user, and adds specific IP entries to pg_hba.conf. Additionally, the script installs PHP Composer globally and configures Nginx to serve PHP files by creating a virtual host. The last steps involve restarting services and displaying the installed versions for Nginx, PHP-FPM, PostgreSQL, and Composer. The script aims to streamline the process of setting up a comprehensive web development environment on an Ubuntu system.