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iOS 11, the latest version of Apple's mobile operating system, has start rolling out to iPhone and iPad users.

First revealed by Apple at its Worldwide Developer's Conference (WWDC) in June, the next-gen mobile device software has been redesigned to coincide with the tenth anniversary of the iPhone, and includes a completely overhauled App Store.

Other new features of iOS 11 include a new version of the Siri voice assistant, Boomerang-style looping live photos, and a new "Do Not Disturb While Driving" feature.

"We’re going to take the world's best and most advanced mobile operating system and turn it up to 11," said Apple's Senior Vice President of Software Engineering Craig Federighi.

Here are some of the highlights of iOS 11 .

Release date and UK time

The new operating system was released to the public as a free software update on Tuesday, 19 September, a few days before the iPhone 8 and 8 Plus go on sale.

The update went live at 10am Pacific Time, which translates to 6pm here in the UK.

It is available for iPhone 5s and later, all iPad Air and iPad Pro models, iPad 5th generation, iPad mini 2 and later and iPod touch 6th generation.

Revamped App Store

Apple has completely redesigned its App Store for the first time in nine years, to make it easier for iPhone and iPad users to discover new apps and games.

The new-look store has several new tabs along the bottom of the screen enabling users to filter by Games, Apps and "Today" - a daily changing selection of highlights from the App Store.

The Today tab will also include in-depth features and interviews with developers, as well as exclusive premieres, new releases tips and how-to guides.

Apple has introduced an Updates tab, allowing customers to quickly see what has changed in their favourite apps and games with the latest update.

Search has also been enhanced, allowing users to search by name, category, developer or topic, and receive relevant results for specific apps and games.

Updated Siri

Perhaps the biggest new feature of iOS 11 is the overhauled version of its Siri voice assistant.

Apple has used machine learning to create more natural voices for both the male and female versions of Siri, adjusting intonation, pitch, emphasis and tempo while speaking.

There's also a new visual interface that offers suggestions based on personal usage of apps such as Safari, News, Mail and Messages.

Siri has been updated to better understand context and offer results that it thinks the user will be interested in.

What's more, a new translation capability will translate English words and phrases into Chinese, French, German, Italian or Spanish, with more options coming later on.

Indoor maps

Apple has added detailed floor plans for shopping malls and airports within its Maps app.

At first, these will cover a small selection of world cities, including London - and Heathrow and Gatwick - with more locations to be added at a later date.

Speed limits and lane guidance have also been added to make navigating on the roads a little easier.

Do Not Disturb while driving

Building on its Do Not Disturb function, Apple has introduced a potentially life-saving Do Not Disturb While Driving feature, to ensure drivers stay focused on the road.

This works by detecting when you are driving and automatically silencing notifications to keep the screen dark.

Users also have the option of sending an auto reply to contacts listed in Favorites to let them know they are driving and cannot respond until they arrive at their destination.

Looping Live Photos

Apple is introducing new Loop and Bounce effects to Live Photos, allowing users to create continuous video loops - in a similar way to Instagram's Boomerang feature.

The updated Photos app will also automatically create "memory movies" from collections of photos of pets or birthdays on your iOS device.

Apple has improved the experience of taking photos in portrait mode - bringing them into line with landscape photos with features such as optical image stabilisation, True Tone flash and HDR.

Moreover, Apple introduces a new technology called High Efficiency Image File Format that reduces the file size of every photo taken, so they take up less space on your iPhone.

Augmented Reality

Following the massive success of Niantic's Pokemon Go app last year, augmented reality has shot to the top of the agenda.

This means apps that overlay computer graphics on top of real-world images.

Apple is introducing a new platform for developers to help them bring augmented reality experiences to iPhone and iPad using the built-in camera and motion sensors.

ARKit allows developers to tap into the latest computer vision technologies to build virtual content for interactive gaming and immersive shopping experiences.

One such game - Wingnut AR - was showcased at WWDC and will be landing later in the year.

Money transfers in iMessage

With iOS 11, Apple is integrating Apple Pay into the Messages app, allowing users to make and receive payments with friends and family instantly on their phones.

Users can send money and get paid in Messages, or tell Siri to pay someone, using the credit and debit cards they already have in Wallet.

When users get paid, they receive the money in their new Apple Pay Cash account, which they can send on to someone else, or make purchases using Apple Pay in stores, apps and on the web.

Alternatively, they can transfer it from Apple Pay Cash to their bank account.

Person-to-person payments and Apple Pay Cash will launch in the US in the autumn. The company has not yet announced plans to launch it in other countries.

FaceID and Animojis

iOS 11 will include a couple of features that are specific to the iPhone X, which was unveiled at Apple's special event at its new headquarters in Cupertino on September 12.

These include FaceID - a new authentication technology that can verify the user's identity by scanning their face in 3D. FaceID replaces TouchID on the iPhone X.

iOS 11 also includes support for Animoji- 3D, live rendered emoji, which track your facial expressions and create animated characters to use in iMessages.