STEM is consist of 4 majors:

• Science
• Technology
• Engineering
• Mathematics

Science -  is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.

Technology - is the collection of techniques, skills, methods and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, etc. or it can be embedded in machines, computers, devices and factories, which can be operated by individuals without detailed knowledge of the workings of such things.

Engineering - is the collection of techniques, skills, methods and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, etc. or it can be embedded in machines, computers, devices and factories, which can be operated by individuals without detailed knowledge of the workings of such things.

Mathematics -  is the study of topics such as quantity (numbers),structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics.