In 21st century everyone uses smart-phone. For example, we can read the news, play games, listen to music or watch a movie. Having a Smartphone makes it much more easy to check your email, social media or even your bank account while on the go. But there are also limitation of Smart phone because we cannot connect directly connect a USB or Ethernet cable with our phone and other multiple devices. So we add some applications of laptop in phone. so it is easy to carry only phone rather than carrying laptop.