Tablature (also known as Tab) is an alternative to standard notation. It is used by guitar players or people who play fretted instruments. Guitar tab looks like a guitar neck, with the six strings. (a guitar neck is between the body and head of the guitar, and the frets are along the neck, seperated by metal bars)

When reading the tab, you will come across numbers, the numbers represent the fret number. For example, if there is a number 1 on the top line, you would hold down the first fret on the top string. There is one exception to this, as there is no fret 0. If you see a 0, you play the string open. 

You may be thinking, how can numbers and lines show the rhythm? As shown below, the rhythm is typically written underneath the tab. In this example to the right, you can see the first two notes are quavers as it is a single bar, the second two notes are semi quavers as there is a double bar and the final note is a crotchet as it just a stem.

Here is the guitar tab for Twinkle Twinkle Little Star. The first three notes are on the 3rd fret on the A string, which is a C followed by two notes on an open G string which is a G. After that there are 2 As, followed by another G.

This example doesn't have rhythm, as the rhythm is commonly known.

How many different notes can you identify?