The term shareware (also known as trialware or demoware) is proprietary software that is provided to users without payment on a trial basis and is often limited by any combination of functionality, availability. Shareware is often offered as a download from an Internet website or as a compact disc included with a periodical such as a newspaper or magazine. The rationale behind shareware is to give buyers the opportunity to use the program and judge its usefulness before purchasing a license for the full version of the software.