Which of the following is a common type of outdoor power equipment used for grass cutting?

A lawn mower is the correct choice for outdoor power equipment commonly used for grass cutting. This equipment is specifically designed for mowing grass and maintaining lawns. There are various types of lawn mowers, including push mowers, riding mowers, and those that operate on batteries or are self-propelled, all of which are tailored to effectively trim grass to a desired length.

In contrast, a tractor is typically used for larger agricultural tasks and may support various attachments, such as a mower deck, but it is not primarily designed for the specific purpose of grass cutting. A chainsaw is utilized for cutting wood and trees, making it unsuitable for lawn maintenance. A snow blower is designed for clearing snow and would not be applicable in the context of grass cutting. Therefore, the lawn mower stands out as the most appropriate equipment for this task.