Eyeliner comes in all different shapes and forms nowadays! You can find the in liquid, gel, or pencil form and it is one of the simplest ways to add definition to your eyes. I always tend to stick to pencil eyeliners, as I find them to be the most convenient ones, although they do have their limitations. It's harder (I'd even dare to say impossible) to get a sharp line, similar to what you can achieve with gel or liquid eyeliners, with a kohl pencil.
However, they are brilliant for creating that smudged, slightly smokey line on either the lower or upper lash line, which can be the perfect, subtle touch to help define your look without looking too harsh. As I'm all about using little practical tricks to achieve a quick, more polished look, that is my favourite way to use eyeliner!
I highly recommend the ones from the Rimmel Scandaleyes line! They come in about seven different shades and the quality is unbelievable. They stay put all day long and are by far one of the best budget buys ever, coming in at only £3.99. You do have to get a cosmetic pencil sharpener as well, though, as they are not the twist up kind. They're definitely worth it, all the same!
What is your favourite way to use eyeliner?