The companies you have worked for, dates of employment, the positions you held and a bulleted list of responsibilities and achievements should be included in the experience section of your resume. If you have an extensive work history, you don't need to include all your employers. Rather, include the last 10 - 15 years of employment.
Internships, summer jobs, and temporary jobs, in addition to permanent postions, can all be included in this part of your resume.
