A lawn roller is a gardening tool used to flatten and smooth out the surface of a lawn. Typically made of heavy materials like steel or concrete, it is filled with water or sand to increase its weight. Lawn rollers help to eliminate bumps and uneven areas, promoting healthy grass growth by ensuring better seed-to-soil contact. These tools are often used after seeding or sodding to press the seeds into the soil. They can also be beneficial in compacting soil in garden beds or around newly planted trees and shrubs. Regular use of a lawn roller can enhance the overall appearance of a yard, making it look well-maintained.