Amboss is an interactive library (including videos, images, tests and your own notes) for study (and teaching) of medicine.
You can get familiar with the Amboss features from webinar recording
Amboss is an individually licensed e-resource, with licenses allocated by each medical faculty according to its own internal mechanism (usually to upper-year students). If you are a medical student, check with your faculty library to see if you are eligible for a license.
If you already have a license, follow the instructions to activate it.