Containers are the future of web development, in large part thanks to Docker’s explosive growth. According to DataDog, 15 percent of hosts run Docker, which is significantly up from the 6 percent of hosts running it at this point in 2015. LinkedIn has also seen a 160 percent increase in profile references to Docker in just the past year alone, indicating Docker has become a much bigger priority for IT professionals looking for work. With this technology primed to continue its exponential growth in the coming years, here’s a Q&A rundown of the basics: consider it Containers 101.