Pentatonic scales have five notes, from penta meaning five

A minor pentatonic (A, C, D, E, G, A)

The structure of the minor pentatonic scale is root, minor third, perfect fourth, perfect fifth, minor seventh or in guitar talk, root then up 3 frets, 2 frets, 2 frets, 3 frets and 2 frets. There is also a major pentatonic scale.

Some players may try and tell you that the pentatonic scales are beginner scales, don't listen to them, most memorable riffs and solos have been written in the minor pentatonic scale

This scale has many applications, for further information contact me for a private lesson

The blues scale has one extra note to the pentatonic scale (a flat five)

A minor pentatonic (A, C, D, E♭, E, G, A)

The added a flat 5 (or tritone) sounds ‘wrong’ against the root, think of the intro to ‘Purple Haze’ or the main riff from the song ‘Black Sabbath’, by the band ‘Black Sabbath’ on the album ‘Black Sabbath’. That dark sounding note is what you are adding

The idea is not to ‘land’ or ‘resolve’ on this flat 5, but pass through or around it.

Try playing Root, minor 3, 4, flat 5, 4, minor 3 and keep playing up and down, this is the extra element, the bluesey sound.