why advertisers are also called sponsors?

(explain it simple and easy to understand)

Advertisers are basically trying to convince the consumer to purchase their product.
Sponsors help pay for an event of sorts in order to advertise whatever they are selling.
Panasonic sponsored the Super Bowl for the Seahawks.
Unfortunately, due to the loss, Panasonic did not get as much money as they had hoped to get.
(cough cough nice pass.)