ELI5: Explain Like I'm 5

Open-source software security

Open-source software security means making sure the software is safe to use. Computers are powerful and can do many different things. But without security, someone could use the same code to access your data or do something bad. So, open-source software security is like a lock and key for computer programs. Software developers make sure that no one else can use the same code to get into places they're not supposed to be. This way, your data is more secure.
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