A wet mop and a dry mop serve different cleaning purposes and are designed for distinct tasks. 
A wet mop is primarily used for deep cleaning and sanitizing floors. It consists of a handle with a mop head made of absorbent materials like cotton, microfiber, or sponge. The mop head is soaked in water or a cleaning solution, allowing it to effectively remove dirt, grime, and stains from hard surfaces such as tile, linoleum, or hardwood. Wet mops are ideal for tackling sticky spills, mud, and other stubborn residues. They often require a bucket with a wringer to remove excess water, ensuring the floor is not overly saturated, which could cause damage, especially to wood floors.
In contrast, a dry mop, also known as a dust mop, is used for dusting and light cleaning. It features a flat or slightly fluffy head made of materials like microfiber, wool, or synthetic fibers that attract and hold dust, hair, and small debris. Dry mops are excellent for daily maintenance, as they can quickly sweep up loose particles without the need for water or cleaning solutions. They are particularly useful on hardwood, laminate, and other smooth surfaces where dust and pet hair tend to accumulate. Dry mops are often lightweight and easy to maneuver, making them suitable for quick clean-ups.
In summary, the primary difference lies in their function: wet mops are for deep cleaning with water or cleaning agents, while dry mops are for dusting and light cleaning without moisture. Each type of mop is essential for maintaining clean floors, with wet mops handling tougher messes and dry mops managing everyday dust and debris.