Side Lighting is where light falls onto a subject from the side in relation to the camera's positioning.
Front Lighting is where light shines onto the side of the subject facing directly towards the camera.
Front lighting - Depending on where the light comes from produces different effects, if the light comes from above it produces what is known as "butterfly lighting" this is because it makes a shape that is very similar to a butterfly under the nose Front Lighting can also be called Glamor lighting as it is often used when photographing female models etc, Front lighting is usually used to photograph females as it highlights the more feminine features it also softens the jawline and the check bones.