Highlights are a versatile and simple way of changing your hair colour without the danger of going for an all-over colour that you might not like. They can add interest to your hair but they won’t necessarily detract from your look. You can have as many or as few highlights as you like, giving yourself options.
The main thing to discuss with your hair stylist is the shade you would like. Choose a shade that will complement your skin tone and your natural hair colour. Your stylist will be able to use a colour chart to show you a variety of shades and hold them up next to your skin to give you an idea of how they look.
Have a look through hair magazines and on the internet to get an idea of the look you like. It you are concerned about roots, highlights are ideal as they will disguise your regrowth.