Question: what is the difference between a forward slip and a side slip?
Answer: A forward slip is used for losing altitude. A sideslip is defined to be a slip where the fuselage is parallel to the line of travel. A sideslip is used for landing in a crosswind. ... When the wind is blowing across the runway they called it a "side" wind and, hence, the slip used to offset this wind is called a sideslip.