system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What the heck is an 'open source platform' for website building?
gpt
Open Source is a phrase used to describe a methodology of software development. Instead of keeping the code closed and only allowing people use the software when it's assembled, they share the base code with everyone so they can work with it as well.

This inspires people to find bugs, security flaws, and bad features, then develop and submit their own fixes and improvements. Open Source software, if we'll used and popular, can be very security and full-featured, as well as kept up to date and modern.