What is "Zero Day Vulnerability"

A zero-day exploit is one that takes advantage of a security vulnerability on the same day that the vulnerability becomes generally known. 
There are zero days between the time the vulnerability is discovered and thefirst attack. it is called as 0 (Zero Day Vulnerability)

In Simple Words :- Suppose you found a flaw or vulnerability in Facebook that can bypass login and hack any a/c and enter in anyone ID's without Password, and on the same day you are taking advantage of that Flaw without reporting to anyone. This is called 0 Day Vulnerability and on next day, It will be patched or fixed up.

# Vulnerability = Weakness point of Computer Program or Web application that can be Exploded by any Hacker.

# Flaw = A Security Flaw in Web Application such as XSS Flaw in web application which allow an attacker to steal data.

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