Drupal distributions are pre-built versions of Drupal for specific use cases.
Need an eCommerce store? Use Commerce Kickstart.
Are you a local council looking for a new website? Look at LocalGov Drupal.
Contenta CMS is an API-first Drupal distribution for headless and decoupled content.
There are numerous others - each containing a list of pre-installed and configured modules to give you more functionality out of the box.
If you're starting a new project, try starting with an appropriate distribution instead of starting from scratch with a standard installation of Drupal core and save yourself time and effort.
I'm an Acquia-certified Drupal Triple Expert with 17 years of experience, an open-source software maintainer and Drupal core contributor, public speaker, live streamer, and host of the Beyond Blocks podcast.