What happens if i jailbreak my iohone 4s?

If i was to jailbreak my iphone, what would be different? And how can i do it?

You will straight away lose your guarnty or warenty (if you have one) and therefore you will not get any replacement

Jailbreaking is the process of removing the limitations imposed by Apple through the use of software exploits. It allows iOS users to gain root access to the operating system, allowing them to download additional applications, extensions, and themes that are unavailable through the official Apple App Store. Jailbreaking is a form of privilege escalation. Yes, you will loose your warranty while your jailbroken, but once you restore your device you will get the warranty back. Do not jailbreak if you don't know what you're doing.

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