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.
Don't know if using a distribution could help for you? [Book a 1-on-1 consulting call][call], and I'll help you out.