YouTube reviewers are individuals who create video content to evaluate and provide opinions on various products, services, or experiences. They often focus on categories like technology, beauty, gaming, and food, sharing their insights with viewers. These reviewers typically showcase the item, demonstrate its features, and discuss its pros and cons, helping potential buyers make informed decisions. Many YouTube reviewers build a following by engaging with their audience through comments and social media. They may collaborate with brands for sponsored content or receive products for free in exchange for their reviews. Popular YouTube reviewers include Marques Brownlee for tech and NikkieTutorials for beauty.