What is an open source product or an OSS( OPEN SOURCE SOFTWARE )? Open source products are the end products of the product creators whose source codes are kept open to the public. Due to its flexibility, people can view the code and desired programmers can modify it ,alter it to meet their personal needs and can redistribute it to other active developers within the community.
OAuth is an open standard for access delegation, commonly used as a way for Internet users to grant websites or applications access to their information on other websites but without giving them the passwords. OAuth provides clients a "secure delegated access" to server resources on behalf of a resource owner.