Bootstrap provides three main container classes:

1. .container: Fixed-width container with responsive breakpoints

   • Provides max-width at different screen sizes
   • Centers content horizontally

2. .container-fluid: Full-width container

   • Spans 100% of the viewport width
   • No maximum width restrictions

3. .container-{breakpoint} (Bootstrap 4+): Responsive containers

   • .container-sm, .container-md, .container-lg, .container-xl, .container-xxl
   • 100% width until specified breakpoint, then behaves like .container