What is dry etching?

Dry etching plays an indispensable role in the manufacturing of semiconductors and electronic components.

First, etching is a process of removing unwanted portions of depositions on semiconductors. This is done by transferring a mask pattern onto thin film, and removing the leftover part not covered by the mask, leaving the film in a desired shape.
What is dry etching?

What is plasma?

Plasma is the volume exceeding the average distance covered by the interaction between the two charged particles, in a system containing two or more charged particle groups of different signs of charge, where at least one of which is undergoing irregular thermal motion.

What is plasma?