Homonym: jack (Card)
A "jack" can refer to a tool used to lift heavy objects, like cars. For example, when you need to change a tire, you use a car jack to raise the vehicle off the ground. This makes it easier to remove the tire and replace it with a spare.
In another context, "jack" can also mean a playing card, specifically the jack of hearts or jack of spades. In card games, the jack is often valued between the ten and queen, and it can play a crucial role in winning a hand.