Every course comes with an Adobe Authorised completion certificate. This is either for the specific application (e.g. Acrobat, Flash, InDesign, Photoshop) or for a Masterclass, which might contain multiple applications.
You can show this certificate to current/prospective employers as evidence that you attended the course(s).
* The certificate is different to the Adobe Certified Associate and Expert (ACA and ACE) accreditations.