When images or other textures are mapped to materials, that mapping is performed using texture coordinates from either UV Map or a Texture Space. Use this tag for questions related to texture coordinates and the texture coordinate mode. Use the UV tag for questions related to UV maps.
The manual describes the Texture Coordinate Node thusly:
The Texture Coordinate node is commonly used for the coordinates of textures, typically used as inputs for the Vector input for texture nodes.
In addition to UV Maps, texture coordinates can be Generated, they can be Object coordinates, or they can take other forms.
Use this tag for questions related to the Texture Coordinate Node or the various coordinate systems, except UV Maps. Use the UV tag for questions related to UV maps.