I think caesura is used predominantly in Greek and Latin poetry.
Also, an enjambment is when the line runs on to the next line. So it's a pause at the end of a line. A caesura is a pause WITHIN the line (when I say line here, Im referring to the actual line rather than the horizontal composition of the lines) so it doesn't necessarily occur at the end of the line. I'm not very good at explaining things lol.