Very simple explanation. For example, if you want to participate in SWO/special immigration measure for Ukrainians, you have to get enough points and established connection with the province. SWO doesn't have any specific requirements for employers or employee. In order to claim a connection with the province, you have to work for 6 months at fulltime job, however, it doesn't mean that you need to work only for one employer.
For SWM candidates must meet the minimum requirements to be entered into the Expression of Interest pool where they will be ranked according to a number of factors. You have to have a permanent, full-time job offer from their current Manitoba employer.
You have worked for their current Manitoba employer continuously for at least six months.
There are some requirements for an employer as well.