The Standard Model (SM) is a set of theories that describe fundamental particle physics and the interactions of all known elementary particles, except gravity. Kick-started by Sheldon Glashow’s discovery of combining electromagnetic and weak interactions in 1961, it has evolved since then into its current form that we know today. Many precision analyses have been performed at many particle physics experiments such as AGS, E288, PETRA, UA1, D0, DONUT, and the experiments at the LHC. All of these experiments have measured the cross-section for various processes and show good agreement to the predictions of the Standard Model. This chapter provides background information about the Standard Model, the theories, and its particles. There are still many other puzzles of the Standard Model that need to be reconciled and will be discussed in this chapter as well.