Instead of sliding immediately to a note, it is also possible to hold a note for a specific tim value before sliding to another note. This is called a valued slide. It is indicated by a curved line connecting the two notes, and the symbol "S".
This example demonstrates the difference between valued slides adn grace note slides.
Here is a Blues lick which makes use of slides. Experiment with slides to any of the notes in the pentatonic scale and create some of your own licks.