Why were tanks good in the World War 2?

Answer 1

The second world war saw about a new form of combat, as the first world war primarily focused on trench warfare the second world war was much more mobile and tanks with their higher mobility than emplaced weapons were much more effective at breaking enemy lines than previous methods such as infantry charges and prolonged bombardments which would cause a battle of attrition.

Tanks also provided more protection to soldiers in large scale firefights by making a wall between enemy soldiers or by drawing the enemies fire from the unprotected infantry.