What is the difference between Trap and Interrupt?

Question

What is the difference between Trap and Interrupt?

If the terminology is different for different systems, then what do they mean on x86?

Answer 1

A trap is called by code like programs and used e. g. to call OS routines (i. e. normally synchronous). An interrupt is called by events (many times hardware, like the network card having received data, or the CPU timer), and - as the name suggests - interrupts the normal control flow, as the CPU has to switch to the driver routine to handle the event.