In mathematics, a Lie groupoid is a groupoid where the set of objects and the set of morphisms are both manifolds, the source and target operations
are submersions, and all the category operations (source and target, composition, and identity-assigning map) are smooth.
A Lie groupoid can thus be thought of as a "many-object generalization" of a Lie group, just as a groupoid is a many-object generalization of a group. Just as every Lie group has a Lie algebra, every Lie groupoid has a Lie algebroid.
Read more about Lie Groupoid: Examples, Morita Morphisms and Smooth Stacks
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“All round and round does the world lie as in a sharp-shooter’s ambush, to pick off the beautiful illusions of youth, by the pitiless cracking rifles of the realities of age.”
—Herman Melville (1819–1891)