As stated elsewhere in this section, lawn edgers come in a variety of shapes and sizes, some are mechanical, some are petrol powered and some are driven by revolutionary lithium-ion batteries.
The type you need will depend greatly on the size of lawn you want to cover, whether you are happy to bend or kneel while working and whether you want to make the task virtually effortless or get up close and personal with your lawn.
Look at these individual articles for more detail -
Hand Held, Battery Powered Lawn Edgers
Spring-Assisted Hand Held Lawn Edgers
Hand-Held Petrol Powered Lawn Edgers
Walk Behind, Wheeled Lawn Edgers