The trophic levels are each level through which energy or food transfer in a food chain or food web..
The example of food chain:
Grass→grasshopper →Frog →Snake→Hawk
Grass is the first trophic level.
Grasshopper is the second trophic level.
Frog is the third trophic level.
Snake is the fourth trophic level.
Hawk is the fifth trophic level.
Final Answer:
The trophic levels are the levels formed by the organisms belonging to same food habits.
Grass→grasshopper →Frog →Snake→Hawk