It most text editors if you select a piece of text and press any
key (that’s not bound to some command) the selection would be replaced
by the character bound to the key (or deleted if you press
Backspace). In Emacs things look differently - by default typed
text is just inserted at point, regardless of any selection.
Of course, there is a way to change this:
transient-mark-mode is also enabled (it is enabled by
default since Emacs 23) any typed text replaces the selection if the
selection is active.
Personally I find this behavior more useful than the default
one. That’s why it should be no surprise that
is enabled by default in