Shareware, also known as trialware or demoware, is software that is distributed online for free and can be used by anyone for a limited period of time. After the trial period, the user must either purchase a license to continue using the software or uninstall it. Other synonyms for shareware include freeware, which is software that can be used and distributed for free with no trial period, and commercial software, which is software created and distributed with the intention of making a profit. Other terms that are sometimes used to describe shareware include donationware, which is software that is distributed for free but asks for a donation, and adware, which is software that displays ads to users.