The video shows a person using a fish finder to locate fish underwater. The fish finder is a device used by fishermen to locate fish by detecting their presence underwater. The person is using a finger to point at the screen of the fish finder, which displays a graphical representation of the underwater environment. The graphical representation is color-coded, with different colors representing different depths and types of fish. The person is likely trying to identify the location of fish in the water, which is a common practice in recreational fishing.