What are the differences between 12/8 and 6/8 time signatures in music?

The main difference between 12/8 and 6/8 time signatures in music is the number of beats in each measure. In 12/8, there are 12 eighth notes in a measure, grouped into four groups of three. In 6/8, there are 6 eighth notes in a measure, grouped into two groups of three. This affects the feel and emphasis of the music, with 12/8 often feeling more complex and divided into smaller subdivisions compared to the simpler feel of 6/8.