Simple Definition:

Urea is a chemical compound that is found in urine [the liquid waste product produced by the body] and is also synthesized for use in fertilizers, plastics, and pharmaceuticals. It is a waste product formed in the liver during the breakdown of proteins and is eliminated from the body through urine.

Examples:

• Urea is used as a nitrogen-rich ingredient in fertilizers to help promote plant growth.
• The production of certain plastics involves the use of urea as a raw material.
• Some medications contain urea as an active ingredient for treating certain skin conditions.

Very Simple Definition:

Urea is a substance [material] found in urine and also used in fertilizers, plastics, and medicines.

Examples:

• Urea helps plants grow better.
• Some things are made using urea, like plastic objects.
• Some creams or ointments contain urea and can be used to treat skin problems.