How does a zero-day exploit differ from a typical exploit?

What will be an ideal response?

ANSWER: A zero-day exploit, or zero-day attack, is one that takes advantage of a software vulnerability that hasn't yet or has only very recently become public. Zero-day exploits are particularly dangerous because the vulnerability is exploited before the software developer has the opportunity to provide a solution for it or before the user applies the published solution. For example, Microsoft schedules regular security updates to Windows on the second Tuesday of each month, called Patch Tuesday. Hackers can use this information to identify unannounced vulnerabilities in Windows, and then immediately proceed to attack unpatched machines.