Wordpress htacess code functionality

I found this code inside the .htaccess file of a website I have to work on to make a few modifications:

#BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /ambienteTrabajo/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /ambienteTrabajo/index.php [L]
</IfModule>
#END WordPress

I'm not an apache expert so I would appreciate your help to clarify (general or specific terms), what does this code do?

Thanks!