Root itself is just a user with elevated permissions(root acess), who can do anything to any file or folder in the system. It's often dangerous, always powerful.
Rooting is often performed with the goal of overcoming limitations that carriers and hardware manufacturers put on some devices. Thus, rooting gives the ability (or permission) to alter or replace system applications and settings, run specialized apps that require administrator-level permissions, or perform other operations that are otherwise inaccessible to a normal Android user. On Android, rooting can also facilitate the complete removal and replacement of the device's operating system, usually with a more recent release of its current operating system.
REASONS TO ROOT YOUR ANDROID
1) Unlock Hidden
Features and Install "Incompatible" Apps
Sometimes, even Android isn't open enough to give you some of the features you want. Either an app is blocked by carriers, hacks into Android's system files, or otherwise isn't available. Luckily, rooting can help with that: you can install carrier-blocked apps, get features from the latest version of Android, make incompatible apps compatible, power up your hardware, get features like Beats Audio from other phones,you can hack wifi with apps like reaver and bcmon or emulate exclusive features like those on the Moto X. Whatever you want, rooting gives you the power to do a lot more
2)Automate Everything
You've probably heard of Tasker, the awesome app that automates just about anything on your phone. You don't need to root your phone to use it, but if you're rooted, it can do a whole lot more. Certain tasks, like toggling 3G, GPS, changing CPU speed, turning the screen on, and others require root access. So, if you want to get the full benefit of an app like Tasker, you'll definitely want to root your phone. For more automation inspiration, check out your best Tasker actions, as well as our most recently featured Tasker tricks
3)Boost Your Phone's Speed and Battery Life
Look, we of all people understand the need for occasional ads—it's how we make money. But ads can also get in the way and use up data. If you want to block ads in certain apps or on certain devices, rooting is by far the best way to do so. AdFree, AdBlock Plus, and Ad Away are all great options
5)Back Up Your Phone for Seamless Transitions
When you move to a new Android device—or restore your device to stock
for any reason—you can make your life a lot easier by backing up your apps and settings first. That way, you canget your entire setup back in just a few taps. If you aren't rooted, you can back up a few things like apps and data, but you won't necessarily be able to backup system apps and their data, or automate the entire process as well as Titanium Backup can.
6)Remove Pre-installed Crapware
Titanium Backup is good for more than just backups, too. It can also uninstall that annoying, battery-draining, space-wasting crapware that comes preinstalled on so many phones these days—and, sadly, this feature is root-only. Freeze them first to make sure your phone operates normally without them, then delete them completely to free up that space. You'll be glad you did.
7)Tweak the Dark Corners of Android
If you're the kind of person that likes to fiddle with every little feature—both on the surface and under the hood—rooting is for you. Whether you want to customize your keyboard layout withsomething like Keyboard Manager or give yourself faster scrolling, improved multitasking, and extra themes with Pimp My ROM, rooting gives you the power to tweak just about any corner you can think of. If you want to do it, chances are
someone over on a forum like XDA has created a mini-app or tweak that will help.
8)Flash a Custom Kernel
Some of Android's most under-the-hood tweaks require a custom kernel, which you can only flash with a rooted device. The kernel is responsible for helping your apps communicate with the hardware of your phone, which means a custom kernel can give you better performance, battery life, and even extra features like Wi-Fi tethering (on unsupported phones), faster battery charging, and lots more. You can flash kernels manually or simplify the process with something like Kernel Manager.
Flash a Custom ROM
Okay, so you probably already know about this one—but it's one of the best benefits of rooting. A custom ROM is basically a custom version of Android, and it truly changes how you use your phone. Some merely bring a stock
version of Android to non-stock phones, or later versions of Android to phones that don't have it yet.You can use 30k+ phone features on budget android devices Some add a few handy features, some add lots of really unique features, and some change your operating system from head to toe. No matter what phone you have
DISADVANTAGES
1)Bye Bye Warranty
Once your phone has been rooted, your manufacturer warranty is null in void. This is probably the number one reason for people not rooting their Android devices, but if you decide rooting is not for you, the process is just as easily undone
2)You can turn your
smartphone into a brick
Well, not literally, but if you goof up the rooting process, meaning the code modifications, your phone software can get so damaged that your phone will basically be as useless as a brick.
3)Malware can
easily breach your mobile security
Gaining root access also entails circumventing the security restrictions put in place by the Android operating system. Which means worms, viruses, spyware and Trojans can infect the rooted Android software if it’s not protected by effective mobile antivirus for Android. There are several ways these types of malware get on your phone: drive-by downloads, malicious links, infected apps you download from not so reputable app stores. They take over your phone and make it act behind your back: forward your contact list to cybercrooks, sniff your e-mails, send text messages to premium numbers, racking up your phone, and collect personal data such as passwords, usernames, credit card details that you use while socializing, banking and shopping from your smartphone.
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