Main function of epiglottis is-

Epiglottis is a flap of tissue where the esophagus and windpipe meet. The epiglottis prevents food from entering into the windpipe and thus acts as a trap door. When food is swallowed, the epiglottis lowers and covers the windpipe thus food does not enter the windpipe, while when inhaling the epiglottis raises and air moves into the windpipe.