What is the main idea of the ‘Flipped’ classroom?

Question based on the following passage:

Technology in schools: Future changes in classrooms

Technology has the power to transform how people learn - but walk into some classrooms and you could be forgiven for thinking you were entering a time warp. There will probably be a whiteboard instead of the traditional blackboard, and the children may be using laptops or tablets, but plenty of textbooks, pens and photocopied sheets are still likely.

The curriculum and theory have changed little since Victorian times, according to the educationalist and author Marc Prensky. "The world needs a new curriculum," he said at the recent Bett show, a conference dedicated to technology in education. Most of the education products on the market are just aids to teach the existing curriculum, he says, based on the false assumption "we need to teach better what we teach today". He feels a whole new core of subjects is needed, focusing on the skills that will equip today's learners for tomorrow's world of work. These include problem-solving, creative thinking and collaboration.

'Flipped' classrooms

One of the biggest problems with radically changing centuries-old pedagogical methods is that no generation of parents wants their children to be the guinea pigs. Mr Prensky he thinks we have little choice, however: "We are living in an age of accelerating change. We have to experiment and figure out what works."

"We are at the ground floor of a new world full of imagination, creativity, innovation and digital wisdom. We are going to have to create the education of the future because it doesn't exist anywhere today." He might be wrong there. Change is already afoot to disrupt the traditional classroom. The "flipped" classroom - the idea of inverting traditional teaching methods by delivering instructions online outside of the classroom and using the time in school as the place to do homework - has gained in popularity in US schools. The teacher's role becomes one of a guide, while students watch lectures at home at their own pace, communicating with classmates and teachers online.

(Available in:https://www.bbc.com/news/technology-30814302. Accessed on May 18st, 2019. Adapted. Author: Jane Wakefield.)

What is the main idea of the ‘Flipped’ classroom?