You should include all relevant jobs on your CV (also commonly called a resume). For example, if you’re applying for a customer service role, you should include all positions you have held that have had a customer focus and similar duties to the role you are applying for.
You can also include non-relevant jobs if necessary to make it clear you don’t have any employment gaps. Just don’t elaborate too much on irrelevant jobs unless you can prove you have transferable skills for the position you want.