How do I change the cursor between Normal and Insert modes in Vim?

Question

I would like to know how to change, if possible, the cursor in Vim (in color, shape, etc.) depending on what mode you are in.

I am constantly forgetting that I am not

Answer 1

A popular approach to indicate switching to and from Insert mode is toggling the cursorline option, which is responsible for whether the current screen line is highlighted (see :help cursorline):

:autocmd InsertEnter,InsertLeave * set cul!

or, alternatively:

:autocmd InsertEnter * set cul
:autocmd InsertLeave * set nocul

Modify the CursorLine highlighting group to change the styling of the cursor line to your liking (see :help :highlight and :help highlight-groups).