What is the difference between the COPY and ADD commands in a Dockerfile

Question

In a Dockerfile, what is the difference between the COPY and ADD commands, and when should I use which one?

The COPY instruction will copy new files from <src> and add them to the container's filesystem at path <dest>

COPY <src> <dest>

The ADD instruction will copy new files from <src> and add them to the container's filesystem at path <dest>

ADD <src> <dest>