Chanting is repeating some phrase or lyric over and over typically with multiple people. People have chants at sport events.
Another example of chant is when the American Indians used to chant songs or phrases or lyrics for spiritual reasons. The scene that comes to my head is Indians chanting some lyric around a fire at night.
This is a really obscure example, but if you look up the song “Hooked on a feeling” by Blue Swede, and listen to the beginning of the song, you’ll hear people chanting “ooga chaka ooga ooga chaka” over and over.