## Simple Definition:

A matrix is a rectangular arrangement of numbers, symbols, or expressions, called elements, in rows and columns. The elements of a matrix can be real numbers, complex numbers, or any other mathematical object. Each element in a matrix has a specific address, called its row and column position.

For example,

```
[2 3 4]
[1 5 6]
```

is a matrix with 2 rows and 3 columns.

## Very Simple Definition:

A matrix is a table of numbers or symbols arranged in rows and columns.

For example,

```
1 2 3
4 5 6
```

is a matrix with 2 rows and 3 columns.