Cooperative Work Experience (Co-Op) is an educational program that combines classroom learning with supervised practical work experience. Looking for job offer letter samples?Explore 10 free job offer letter templates suitable for various hiring situations. This agreement outlines the relationship between an intern and a company for a co-op position. The internship offer letter should include the start and end dates of the internship, as well as the number of working hours per week. Ask for the offer in writing. This is an official document that goes out to a candidate when they have been selected for an internship at your company. Prospective Intern – Preferably the complete name of the prospective intern should be written in the recipient field of the internship offer letter. The company is excited to have the intern join their marketing team and support their growth. Discover (and save!) your own Pins on Pinterest.