Envelopes are objects that distort or reshape selected objects. You can make an envelope out of an object on your artboard, or you can use a preset warp shape or a mesh grid as an envelope. You can use envelopes on any object except graphs, guides, or linked objects.
Mesh grid envelope
Envelope created from another object
The Layers panel lists envelopes as <Envelope>. Once you apply an envelope, you can continue to edit the original objects. You can also edit, delete, or expand an envelope at any time. You can edit an envelope shape or the enveloped object, but not both at the same time.