Frequently the word link is used to describe any submanifold of the sphere S^n diffeomorphic to
a disjoint union of a finite number of spheres, S^j.
In full generality, the word link is essentially the same as the word knot โ
the context is that one has a submanifold M of a manifold N (considered to be trivially embedded)
and a non-trivial embedding of M in N, non-trivial in the sense that
the 2nd embedding is not isotopic to the 1st.
If M is disconnected, the embedding is called a link (or said to be linked).
If M is connected, it is called a knot.
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