A predator is an organism that eats another organism. The prey is the organism which the predator eats.
It’s light brown colour helps it to hide in dry grasslands when it hunts for prey (animals to eat). The eyes in front of the face allow it to have a correct idea about the location of its prey.
A deer needs to know about the presence of predators ( animals like lion that make it their prey ) in order to run away from them and not become their prey.