Interaction between two Bodies or their fields is called as collision
Collision is an event in which two or more bodies exert forces on each other for a relatively short time. Collision is short-duration interaction between two bodies or more than two bodies simultaneously causing change in motion of bodies involved due to internal forces acted between them during this.Examples:-An insect touches its antenna to the leaf of a plant. The antenna is said to collide with leaf.When a boxer throws a punch, his fist is said to collide with the opponent\’s face

It\’s strike b/w 2or more bodies
Striking b/w two or more bodies
Takr

Collision is short-duration interaction between two bodies or more than two bodies simultaneously causing change in motion of bodies involved due to internal forces acted between them during this. Collisions involve forces (there is a change in velocity). The magnitude of the velocity difference just before impact is called the closing speed. All collisions conserve momentum.Collisions can be elastic or inelastic.

Collisions occur when one object strikes another. Problems involving collisions are usually solved using conservation of momentum and energy.It is categorized into two types,\tInelastic collision\tElastic collision