Generally, Open Source software is software that can be freely accessed, used, changed, and shared (in modified or unmodified form) by anyone. Open source software is made by many people, and distributed under licenses that comply with the The Open Source Definition.
Open Source Initiative (OSI) is a California public benefit corporation, founded in 1998.
Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.
Open source doesn’t just mean access to the source code. The distribution terms of open-source software must comply with the some criteria.
Open Source Licenses:
Open source licenses are licenses that comply with the Open Source Definition — in brief, they allow software to be freely used, modified, and shared.