Okay kiddo, so a hymn is a special song that people sing to show their appreciation or praise for someone or something. The Hymn to Enlil is a really old hymn that was written a long time ago by people who lived in ancient Mesopotamia. Enlil was their god of the sky and storms.
The hymn talks about how powerful Enlil is and how he controls the weather. It also talks about how he can help people when they are in trouble, like when crops aren't growing or when there is a drought. The people who wrote the hymn wanted Enlil to know how much they respected and admired him.
Now, let's break it down even further. Think about a superhero like Superman. People might sing a special song to show how great they think he is and how he helps people. The Hymn to Enlil is like that, but for the ancient people of Mesopotamia and their god Enlil.