SDS is a fast-track study permit application for residents of certain countries. SDS applicants must purchase a Guaranteed Investment Certificate (GIC) and have proof that they've already paid tuition fees for their first year of education (among other requirements).
Note that an MPOWER loan can not be used to prove payment of first year tuition fees; MPOWER requires a confirmed study permit before disbursing funds. Students seeking a study permit are encouraged to apply through the regular study permit process. The regular process, while slower, can help save students on interest payments and having to purchase a GIC. An MPOWER loan can still be granted all eligible students after the study permit has been approved.