👉 Subbases are a type of finite geometric structure in topology and geometry, which are used to construct more complex structures such as simplicial complexes. They are typically defined as sets of points that meet certain conditions, and they allow for the construction of higher-dimensional analogues of simpler objects like simplices or polytopes. In algebraic topology, subbases can be used to define topological spaces and their continuous functions. For example, in a simplicial complex, a set of vertices (