Glassdoor is a website where current and former employees anonymously review companies. It was launched in 2008 as a site to collect and display company reviews and salary information anonymously. Job seekers use Glassdoor to research companies and gain insight into the workplace culture and work environment based on employee reviews before applying or accepting a job offer. Negative reviews on Glassdoor can impact a company's reputation and ability to attract top talent. Companies should monitor their Glassdoor profile and ratings over time and address negative reviews to improve their employer brand.