**In mathematics, a matrix is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns. A matrix is a collection of numbers arranged into a fixed number of rows and columns. Usually, the numbers are real numbers. In general, matrices can contain complex numbers, but we won't see those here. Among the most common tools in electrical engineering and computer science are rectangular grids of numbers known as matrices. The numbers in a matrix can represent data, and they can also represent mathematical equations. **

- Each number or entity in a matrix is called its element
- In a matrix, the horizontal lines are called rows; whereas the vertical lines are called columns
- Matrices, in general, are denoted by capital letters, say A

Order, elements, types, transpose and operations of a matrix are the major topics covered in this chapter.