Eyecatch?

Hi there! I've been collecting cels for a while, and I've never really gotten a satisfactory definition of what an "eyecatch" cel is. If someone could give me their answer, that would be great.
Thanks!

Eyecatch is what they call the still frame or short animation sequence that they put in anime shows at the halfway point so they can insert a commercial. I have one in my Slayers gallery if you want to see one.