Milky Way Galaxy Collision with Andromeda

Outer Space - The Andromeda-Milky Way Collision is a galactic collision that is expected to occur in 4 billion years between the two largest galaxies in the Local Group-the Milky Way and the Andromeda Galaxy but where the stars involved are separated by a large enough distance to make it impossible for any stars to collide.

What will happen if the Milky Way collides with the Andromeda galaxy? Did Andromeda and Milky Way collide? Will Earth be destroyed when the Milky Way and Andromeda collide?