Spring Tide-
Spring Tides are especially strong tides.They occur when the Earth,Sun and Moon are in line.The gravatational forces of the Moon and the Sun both contribute to tides. Spring tides only occur during a Full moon and a New moon.
Neap Tide-
A Neap tide is an extremely weak tide.They occur when the gravatational forces of the Moon and the Sun are perpendicular to one another.Neap tides occur only during Quarter Moons.