A call option gives the buyer the right, but not the obligation to buy an asset at a specified price (strike) and a specific time period (expiry). The simplest use for a long call position is the ability to speculate on the appreciation of an asset with leverage while also limiting your downside. However, the flip side to that is the value of the option will depreciate or decay very quickly to zero if it does not trade above the strike price.

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/15bd700a-20b5-457a-8da6-778fe7835ec1/Untitled_Project__Made_with_Clipchamp.mp4

This is also a very good summary of call options and how they work from a community member