Online job boards can be classified into different types based on their scope, focus, and functionality. General job boards, such as Indeed, Monster, and CareerBuilder, are the largest and most popular platforms that cover a wide range of industries, locations, and roles. Niche job boards, like Dice, FlexJobs, and The Muse, specialize in a specific industry, profession, or demographic. Aggregator job boards, like Glassdoor, ZipRecruiter, and SimplyHired collect and display job listings from multiple sources. Finally, social media job boards leverage the power of social media platforms to connect job seekers and employers; examples include LinkedIn, Facebook, and Twitter.