The RAND function in Excel generates a random decimal number between 0 (inclusive) and 1 (exclusive). Here's how you can use it:

1. Enter the formula: In the cell where you want the random number to appear, type the formula `=RAND()`.
2. Press Enter: Hitting Enter will execute the formula and display a random decimal number between 0 and 1.

Here are some additional points to consider:

* Recalculating random numbers: By default, RAND is volatile, meaning it recalculates whenever any change is made to the worksheet. This can be helpful if you need a new random number each time, but it can also slow down your spreadsheet if used extensively.
* Fixing the random number: If you want to keep the generated random number and prevent it from changing with recalculations, press F9 after entering the formula. This will convert the formula result into a static value.
* Generating random numbers within a specific range: You can use the RAND function in conjunction with other functions to generate random numbers within a desired range. For example:
* To get a random number between 10 and 20, use the formula `=RAND()*10+10`.
* To get a random integer between 1 and 6 (useful for simulating dice rolls), use the formula `=INT(RAND()*6)+1`. The INT function here removes the decimal part, leaving you with a whole number.

Remember, RAND is best suited for generating random decimals between 0 and 1. If you specifically need random integers within a defined range, consider using the RANDBETWEEN function, which offers more control over the output.