In staccato playing the notes are played short and separate. This is indicated by a dot placed above or below the note e.g.
To play a note staccato, lift the left-hand finger off the fret as soon as the note sounds. If you are playing an open string, stop the sound with the right hand as soon as the note is played. Listen to the following example on the recording to hear the effect of staccato. Experiment with staccato in your own playing until you can do it naturally.