Federal Skilled Trades

Hey, guys, can somebody explain, what is Federal Skilled Trades? Its one of the category in the express entry.

Skilled Trades currently eligible for the Federal Skilled Trades Prog are organized under these major and minor groups of the NOC:

Major Group 72, industrial, electrical and construction trades,
Major Group 73, maintenance and equipment operation trades,
Major Group 82, supervisors and technical jobs in natural resources, agriculture and related production,
Major Group 92, processing, manufacturing and utilities supervisors and central control operators,
Minor Group 632, chefs and cooks, and
Minor Group 633, butchers and bakers.