What is the dead load and a live load and a dynamic load in a building?

Dead load is the total load of all of the components of the building that generally do not change over time, such as the steel columns, concrete floors, bricks, roofing material etc.

Live load is the sum of the dead load plus the "live" occupants and temporary loads, such as staff in the building, desks, chairs, etc. Things that are contained in the building but do not make up its' construction.

Dynamic load is loading which changes over time, such as wind pressure on the walls, snow loading on the roof, and even earthquake loads.