Model is a mathematical,physical representation or simplified version of a concept, relationship,structure or system of the real world.

Function is a relation which assigns or maps every element of a domain(set) to a unique element of a co-domain(Set).

Algorithm is a step by step procedure to perform a task.

Road map is a detailed plan or explanation to guide us in setting standards or determining a course of action.

Simulation is the imitation of reality by using some tools.