A Netflix account is meant to be shared by people who live together in one household. People who are not in your household will need to sign up for their own account to watch Netflix.
You can manage who uses your account by setting a Netflix Household.
A Netflix Household is a collection of the devices connected to the internet at the main place you watch Netflix. A Netflix Household can be set using a TV device. All other devices that use your Netflix account on the same internet connection as this TV will automatically be part of your Netflix Household.