What is the difference between SDS and Non-SDS visa applications?

In Canada, the student direct stream, or SDS, is an expedited study permit processing program for those who are applying to study in Canada and a post-secondary designated learning institution. To be eligible, applicants must meet specific requirements by providing documentation upfront. In case an applicant is unable to meet the financial requirements of SDS, they can apply under the non SDS visa for Canada.

Hello, student, that extremist option for students from China, India, Morocco, Pakistan, Philippines, Senegal and Vietnam, where they pay one year tuition fees before they file an application for a study permit and provide IELTS as a proof of English. And non SDS is the option to apply without paying the one year tuition fees in advance. Thank you.