What is the difference between stem tendril and leaf tendril?

Leaf tendrils are coiled structures that attaches a plant for support. A leaf tendril will generally have a bid in its axil or will be a modified leaflet of a compound leaf. Example: pea

Stem tendril are a slender, coiled structure that is a modified part of a stem that provides support. A stem tendril is generally in the axil of a leaf or leaf scar. Also, if a tendril originates from an axillary bud, then it is a stem tendril. Example: Virginia Creeper, Grape.