Different Types of Software
Freeware- Software application programs that are free to use and distribute. Often, these programs are written by home programmers and distributed via the Internet at no cost and no future obligation to buy.
Shareware- Software programs that are openly available and usually can be downloaded online. They are often free, though not always.
Public Domain- material that is uncopyrighted, whose copyright has expired, or is uncopyrightable.
Open Source- a definition of software that includes freely available access to source code, redistribution, modification, and derived works.
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