Classification of WavesMedium RequirementMechanical Waves – need a medium to travel through. Examples (Sound waves, Water waves)Seismic waves - these waves cannot travel through a vacuum. They need air, water, or solid materials.Electromagnetic Waves – do not need a medium. Examples (Light waves, Radio waves, X-rays). These waves can travel even in space (vacuum).Direction of Particle Vibration (Relative to Wave Direction)Transverse Waves – particles vibrate perpendicular to the wave direction. Examples (Light waves, Water surface waves)Electromagnetic waves - The vibration forms crests and troughs.Longitudinal Waves – particles vibrate parallel to the wave direction. Examples (Sound waves, Seismic P-waves, Compression waves in springs). The vibration forms compressions and rarefactions.