Business process outsourcing to India is just like when mommy asks a big sister or big brother to help do some chores. Instead of asking big sister or big brother, companies in other countries ask people in India to help them with jobs that are not part of their main business, such as answering calls or doing data entry.
Companies in other countries send their work to India, where people do the work and then send it back. The people in India often work in special buildings called call centers or service centers where they have all the equipment they need to do the job. The companies pay people in India to do the work, and that helps the people in India make money and provide for their families.
Companies choose to outsource to India because it's often cheaper to pay people in India to do the work rather than hiring someone in their own country. Plus, people in India have skills and knowledge that can help the company do the job better.