OWASP
In plain terms
A nonprofit and community known for web security guidance and the Top 10 risks.
Going deeper
OWASP (Open Worldwide Application Security Project) publishes free resources, most famously the OWASP Top 10 list of the most critical web application security risks, guiding developers on what to defend against.
Under the hood
The Top 10 is updated periodically and is awareness-focused, not a complete checklist; OWASP also ships tools like ZAP and the ASVS standard.
Examples
OWASP Top 10, ZAP scanner, ASVS, cheat sheets, dependency-check.
Think of it like...
Like a public-health agency issuing the top ten most common preventable illnesses so clinics know what to vaccinate against first.