@Martin_SmithNov 08.2016 — #Pseudo class is used to define special state of an element. It can be used to style an element when a user mouses over it,style visited and unvisited links differently.
@jenishaNov 21.2016 — #Pseudo-classes are used to add special effects to some selectors. You do not need to use JavaScript or any other script to use those effects. The pseudo-classes allow us to dynamically style content based on its position in the document or its state.