What is Big Data? In the eyes of many people big data may be a very vague concept, but, in bai daily life big data has a very close to us, we are no longer enjoying the convenience of big data all the time, personalized, humanized. A comprehensive understanding of big data we should be from four aspects of a simple understanding. Definition, structural characteristics, what big data around us, what big data brings, these four aspects of understanding. So what exactly is "Big Data"? In the McKinsey Global Institute to give the definition of big data that is a large scale to obtain, store, manage, analyze the data collection that greatly exceeds the capacity of the traditional database software tools. Simply put, big data is a lot of data to the table. The unit of big data is generally measured in petabytes. So how big is PB? 1GB = 1024MB, 1PB = 1024GB is enough to be called big data. What kind of characteristics and structure does big data have? Big data as a whole is divided into four characteristics, first, a large number. Measuring unit PB level, storage content. Second, high speed. Big data needs to be timely and rapid in terms of access speed and analysis speed. Ensure that more people receive the information in a short period of time. Second, diverse. The source of data is obtained from various channels, including text data, image data, video data, and so on. Therefore, the data is diverse. Third, value.