The advantage of using open-source software compared to proprietary software lies in its accessibility and flexibility. Open-source solutions allow users to view, modify, and distribute the source code, promoting collaboration and innovation. Organizations can customize open-source software to fit their specific needs without incurring licensing fees, making it cost-effective. Additionally, the community-driven development model often enhances security and reliability, as vulnerabilities can be identified and addressed quickly by a large pool of contributors. Support and extensive documentation also exist, fostering a strong ecosystem around open-source projects.