Searching for iOS 5 release date on your iPhone 4S or iPad? Well search more. It has already arrived. Apple released its iOS 5 on Wednesday, reinventing its operating system with some 200 new features. Back in June, former CEO Steve Jobs announced the iCloud, which is a synchronization service Apple created to store messages, music and more, on the company's servers in the cloud on the Internet.

Here are a few of the top features of the iOS 5.

Notification Center:  This lets you get all your alerts (new email, texts, friend requests, and more) all in one place. To access the Notification Center, swipe down from the top of any screen and choose which notifications you want to see.

iMessage: iOS 5 users can send unlimited text messages via Wi-Fi or 3G from their iPad, iPhone or iPod touch to anyone with similar devices. iMessage is built into the messages app.

Newsstand: iOS 5 will organize your magazine and newspaper app subscriptions in Newsstand. There is a folder that lets users access their favorite publications quickly and easily.

Reminders: Reminders lets users organize your life in to-do lists incorporating due dates and locations. Reminders works with iCal, Outlook, and iCloud, and so the changes you make are updated automatically on all your devices and calendars.

Twitter: This is integrated into iOS 5 and makes it easy to tweet from your iPhone, iPad, or iPod touch.

Camera: The new camera features in iOS 5 allows you to open the Camera app from the Lock screen. You can compose your pictures with grid lines, pinch-to-zoom gestures, and single-tap focus and more. The volume button allows you to snap photos immediately. If Photo Stream is enabled in iCloud then your photos will automatically download to all your other devices.

Safari: With iOS 5 Safari Reader will display Web articles without ads so you can read without any distractions. There's Reading List lets, which lets users save interesting articles for later. iCloud also keeps this list updated on all devices.

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