What is the diffirence of the trills?

Trills are musical ornaments that consist of a rapid alternation between a note and an adjacent note, usually a step above. The difference in trills often lies in their execution and notation; for example, a "trill" may simply alternate between two pitches, while a "mordent" includes a quick pitch below the main note before returning to it. Additionally, trills can vary in speed, duration, and articulation depending on the style or period of music, influencing their expressive qualities.