Question

What is an oesophagus and what is the movement/wave called when the food enters in it?

Answer 1

when food inter in oesophagus it's called ‛bolus’ and the movement is called peristaltic movement

Answer 2

Oesophagus is a pipe like organ which takes food from the mouth to the stomach during these process of digestion.
The movement is called peristaltic movement.