Open-Source Software (OSS) is computer software that is available in source code form: the source code and certain other rights normally reserved for copyright holders are provided under a software license that permits users to study, change, improve and at times also to distribute the software.Open Source Software means it is a free software and no need to buy, we can use full functionallities from this software with certain Terms & Conditions. This license allows modifications and derived works, and allows us to be distributed under the same terms as the license of the original software.