We say that a finite topological space $F$ is a model of a topological space $X$ if there exists a weak homotopy equivalence $f: X \to F$. A model is minimal if it has the smallest cardinality of all models of a space. Every finite $T_0$ space has its associated simplicial complex. One of the main theorems of this graduate thesis states that the geometric realization of the associated simplicial complex is weak homotopy equivalent to the initial space. This gives us a tool to find finite models of spaces. In this thesis, we will find minimal models of topological spheres and finite graphs.
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