Big data is a topic.

I think you should read the encyclopedia.It's big data

Big data challenges include capturing data, data storage, data analysis, search, sharing, transfer, visualization, querying, updating, information privacy and data source.

Big Data is always growing.Traditional data management tools can't store or analyse the large and complex data set because of it.The three most important characteristics of Big Data are:

A big volume.

Two high rate of generation.

3 different types of information.

In real time, sources like business logs, sensors, web search, devices, video/audio, networks, the web, and social media give out vast amounts of data.