The difference between Call Gate, Interrupt Gate, Trap Gate?

Question

I am studying Intel Protected Mode. I found that Call Gate, Interrupt Gate, Trap Gate are almost the same. In fact, besides that Call Gate has the fields for parameter count

Answer 1

An Interrupt gate is special because the IF flag is automatically cleared. A Call gate is special because it doesn't get activated through an interrupt vector. A task gate is special because it automatically saves the processor state. Four distinct behaviors, having four names for them is convenient.