Algebraic K-theory is a branch of mathematics that studies algebraic structures through the lens of certain generalized "dimensions." It is particularly concerned with the properties of rings and modules, and it provides tools to analyze and classify them. The foundation of algebraic K-theory lies in the concept of projective modules over rings, which can be seen as generalizations of vector spaces over fields.
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Algebraic K-theory studies invariants built from projective modules and their automorphisms over rings. Its lowest groups record the additive projective-module classes and stable invertible matrices, respectively. It differs from Topological K-theory, although vector-bundle clutching and module patching have parallel forms.