When it comes to g-codes that specify machine motion we need to mention G00 and G01.
G00 or also known as rapid or traverse move. G00 command is usually used for moves when machine travels from position to position above the material and when no cutting is applied.
When G00 command is stated we also need to specify in which direction move will occur. For example: G00 X100 Y50
Speed at which this move will be executed is usually maximum speed of machine.
G01 command activates linear motion of machine. We use G01 with moves when machine is moving tool trough material and therefore applying various types of cutting.
Normally speed of G01 move is set with F-word(distance/time). In this case F stands for feed rate, which specifies speed in mm/min or inch/min.
When G01 command is stated we also need to specify in which direction move will occur. For example: G00 X10 Y5 F1000