what are freeware , shareware and proprietary software ?
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Answer:
Freeware
Freeware is any copyrighted software, application or program that may be freely downloaded, installed, used and shared. Such programs are available for use at no cost to general end users. Freeware differs from free software, as the latter allows a user to modify source code for republishing or integration with other software.
Shareware
Shareware is commercial software that is distributed free to users, either in a limited format or on a trial basis that expires after a set number of days. It was first introduced in the early 1980s, with its popularity rising in the 1990s as personal computing moved into the mainstream in both offices and homes.
The format allows software developers to get their products into the hands of potential users for a test run, in hopes that they decide to purchase the fully functional version of the program.
Shareware is also popular with gamers, as it gives them a chance to try a new game on a limited basis before purchasing the full version.
Proprietary software
Proprietary software is any software that is copyrighted and bears limits against use, distribution and modification that are imposed by its publisher, vendor or developer. Proprietary software remains the property of its owner/creator and is used by end-users/organizations under predefined conditions.
Proprietary software may also be called closed-source software or commercial software.