What's the difference between components and devices?

A device is an element composed of multiple elements, which are only single diodes, triodes, field effect transistors, resistors, capacitors, inductors, etc. For example, an operational amplifier is an analog device, which usually consists of dozens of transistors, field effect transistors, diodes, resistors and so on. And can realize the function of voltage amplification. Counter is also a device (digital logic device), which is also composed of many diodes and triodes.