The Federal Skilled Trades (FST) category is one of several ways that you as a foreign national can apply for Canadian permanent residence. Citizenship and Immigration Canada selects foreign nationals in the FST category for Canadian permanent residence based principally on their work experience as a skilled tradesperson.
As of January 1, 2015, potential candidates interested in applying to the Federal Skilled Trades Program, must go through the system. These people have to complete an online Express Entry profile, and meet the criteria to get into the pool of candidates.
As an employer, if you want to hire a skilled worker using this system, you can greatly improve their chances of success by making a qualifying job offer in a skilled occupation.