Home Wi-Fi and broadband is the last part of the internet connection: the few metres from the box where the provider's cable ends, through the Wi-Fi, to the phones, laptops and TVs in each room. When people say "the internet is slow", the problem is very often here, inside the house, and not in the provider's network.
An internet provider is any company that sells broadband to homes. In India, these include the large mobile operators and many smaller local broadband companies. Most new connections are fibre. The provider's fibre runs from its local exchange through a passive optical network (PON), a fibre that is split, without power, to serve many homes. Some homes get broadband by radio instead, through fixed wireless access (FWA), or over the TV cable from a local operator, through cable broadband.
Inside the home, the line ends at the home gateway. In most Indian homes, the provider installs this one box, and it does two jobs. It turns the light signals in the fibre into ordinary network data, and it acts as the Wi-Fi router.
Consider a family in a three-storey house in Nashik. The gateway sits in the living room on the ground floor, and the phones there get 300 Mbps. In the bedroom on the second floor, two concrete floors away, the Wi-Fi signal is weak and video calls freeze. The family has two choices. They can buy their own Wi-Fi router or mesh system, with extra units that pass the signal from floor to floor. This is a mesh network. Or they can call their provider. Many providers now run managed home Wi-Fi software on the gateway. With it, the provider's support team can see the weak signal from its office, change the settings remotely, or send a technician with an extra unit.
The question that divides this zone is: who put the Wi-Fi router in the home, the family or the provider? In most Indian homes, it is the provider. That is why internet providers care so much about the Wi-Fi inside the home. It is the part of their service that the customer uses every day, and a customer who is unhappy with it may move to another provider.