Command Dashes require a different input than regular dashes that require the forward-forward input. Command dashes count as special attacks, so they can be special canceled from normal attacks that allow the action. It should be noted that non EX command dashes are usually negative in terms of Frame Data on block or hit when canceled. EX command dashes are usually used for combo extension. Unlike regular dashes, command dashes are not universal to the whole cast.
Command Dashes all have different uses. Some can be used for further pressure and others can be used for resets. Some characters gain command dashes in powered up V-Trigger states. It is recommended for players to learn the frame data on their dashes so they avoid being punished. In Street Fighter V command dashes that pass through the opponent are good for opponents that use attacking V-Reversals a lot, as they usually avoid the reversal and allow a punish. Non EX dashes tend to be negative on block and even punishable when special cancelled into.