Closed Source
Closed source refers to software where the source code is not publicly available, and its use, modification, and distribution are restricted by proprietary licenses. This contrasts with open-source software, where the code is freely accessible and modifiable. Closed-source software is typically developed and maintained by a single company or organization that retains exclusive control over its intellectual property.
Developers should understand closed source when working in corporate environments, developing commercial products, or dealing with proprietary systems where code secrecy is required for security, competitive advantage, or compliance. It's essential for roles involving licensed software, enterprise applications, or industries like finance and healthcare where data protection and regulatory standards mandate controlled access to code.