What is the difference between tray, aligner and bite?

What is the difference between tray, aligner and bite?

Trays and aligners are the same thing: invisible braces in a patented elastic plastic material that the patient removes to eat and changes every 7 or 14 days according to the orthodontist’s instructions, that are used to align the teeth.
The bite, on the other hand, is a sort of “mouthguard” which, depending on the purpose, can serve to protect the teeth from trauma or to treat joint disorders: not all bites are the same and are not used to move the teeth.