G00 command moves a tool to a new position as fast as possible.
CNC (G-code) G00 command moves a tool in a straight line.

G00 command used to get the cutting tool somewhere quickly without any cutting. 

G00 command is modal.
G00 is included in the modal group 1 (Motion) (G00, G01, G02, G03, G33, G38, G80, G81, G82, G83, G84, G85, G86, G87, G88, G89).

Example for CNC (G-code) G00 command:  

G00 X4.2 Y6.8  ; Moves to ( X = 4.2, Y = 6.8)

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