Definition
Open access journals make research freely available online without paywalls, while subscription journals restrict access to paid users or institutions.

Introduction
The global debate over access reflects a deeper question: should knowledge be a public good or a private commodity? Open access challenges traditional publishing by prioritizing accessibility over exclusivity.

Explanation
Open Access (OA) increases visibility, citations, and societal impact. However, authors often pay publication fees (Article Processing Charges). Subscription models, funded by libraries or readers, maintain editorial control but limit readership.
Hybrid models combine both systems, offering OA options within paid journals. The choice depends on funding, target audience, and institutional policies.
The ethical movement for OA, supported by UNESCO and Plan S, emphasizes that publicly funded research should be publicly available.

Key Takeaways
Accessibility shapes influence. Open access democratizes knowledge, ensuring that discovery benefits all, not just a few.

Real-World Case
The Public Library of Science (PLOS) revolutionized open-access publishing, making cutting-edge biological research accessible worldwide without paywalls.
Reference: https://plos.org