These are opportunities for first and second year medical students to get first hand medical experience. These are observerships in the community which offer a different perspective on medicine compared the academic centres.
Clerkship is the time where third and fourth year medical students get to have hands-on experiences with real medical practice. In the community, there is more one-on-one interaction between the student and the preceptor. There are fewer learners at these sites and typically the students get to deal with all of the interesting cases.