The Bootstrap grid System has a limit of 12 columns across the entire page. If a developer does not want to use the 12 columns individually then, it can be merged to create a more full column.

Bootstrap Grid system Classes

 

The grid system has the following four classes-

  • xs (for the phones - screens less than 768px wide)
  • sm (for the tablets - screens equal to or greater than 768px wide)
  • md (for the small laptops - screens equal to or greater than 992px wide)
  • lg (for the laptops and the desktops - screens equal to or greater than 1200px wide)
BY Best Interview Question ON 24 Jan 2019