APP is the abbreviation of English word Application, which refers to the application program in smart phone, and can also be called mobile phone software. It can greatly expand the functions of our mobile phones and facilitate our daily life. For example, commonly used software: WeChat, Alipay, etc. They all belong to an APP. APP has been integrated into all aspects of our lives.

1. Due to the popularity of smart phones, mobile phones and mobile phone numbers have almost become personal identification equivalent to resident ID cards. Even many times, I can use my mobile phone to represent you! In addition to the occasional password, you need fingerprints or brush your face occasionally. 2. There are too many personal privacy information stored in the smart phone, including: personal photos, hobbies, behavior habits, personal connections, geographical location, bank accounts, which can completely describe a living person. Once this information is obtained by others, it is easy to find your weaknesses and then use them. 3. The mobile phone application is also getting your information while providing services. Sometimes you think that apps that are very easy to use can also be easily downloaded and used "for free". Apart from value-added services, it is really cool.

Don't forget the famous saying that "there is no such thing as a free lunch", especially in front of business giants, "free" is only your one-sided understanding, and they will never do business at a loss! 4. When the APP quietly takes information from our mobile phones, we become the contributors and beneficiaries of "big data". We got accurate advertising push, and businesses increased their turnover. Give two simple examples: the products we searched by mobile phones will frequently appear in the advertising recommendations of various apps. By sharing geographic information, we will find that enterprises have invested more in bicycle sharing in high-traffic areas. 5. An APP that looks beneficial and harmless until it is targeted by a liar.