Harry Potter is one the more popular book series to this day. When Harry Potter and the Sorcerers Stone was first published many readers found it easy to relate to. Harry was a young orphan who was forced to live with his Aunt and Uncle. Harry was taught that his parents died in a car accident when he was a baby. Harry was miserable living with his family. He had a small bedroom the size of the cupboard and was their live in butler and maid. On his eleventh birthday Harry discovered that he was a wizard and would be attending the best school for witchcraft and wizardry, Hogwarts. A school teacher picked Harry up and brought him into a whole new world. In this world Harry was famous, he was the boy who lived. When he was a baby Harry and his parents were under attack, which is the real reason Harry became an Orphan. He however lived the infamous killing curse, which is none to kill any one in its path.
Once Harry got a taste of freedom he realized he know longer wanted to live with his Aunt and Uncle. He deserved to be treated better. Escapism is a common theme presented throughout the Harry Potter series. Escapism is the tendency to seek distraction and relief from unpleasant realities. For Harry his escape was going to school each year. For the entire school year he would pack up his belongings, get on the train, and never think about going back to his true "home". He considered Hogwarts to be his home, over his Aunt and Uncles.
Many readers however can also relate to the feeling of needing to escape from the real world. A lot of people liked Harry Potter because it was intoxicating and got everyone hooked on the "what could be" instead of actually what was going on. This brought a group of people together without even knowing. For some people, the fan base was there only way to escape the problems faced in the real world. Those people could turn to each other through social media. Harry as a character was easy to relate to as well. Many kids felt that Harry was a role model. If he could overcome a magic based villain then they can overcome what they were going through too.
Escaping to another world for a few hours a day isn't the worst escape people could turn to. I personally would escape to Hogwarts to get away for a little bit.