.htaccess redirect all pages to new domain

Question

Which redirect rule would I use to redirect all pages under olddomain.example to be redirected to newdomain.example?

The site has a totally

Answer 1

My reputation won't allow me to comment on an answer, but I just wanted to point out that the highest rated answer here has an error:

RewriteEngine on 
RewriteRule ^(.*)$ http://www.newdomain.com$1 [R=301,L]

should have a slash before the $1, so

RewriteEngine on 
RewriteRule ^(.*)$ http://www.newdomain.com/$1 [R=301,L]