Some sites adopt out pets to put on a webpage and use for role-playing in chat rooms.They often require the adoptee to have a page ready for their pet.Sometimes they have a setup for breeding one's pets and then adopting them out.

They are usually kept for companionship or enjoyment.

People may keep a digital pet in lieu of a real pet.

Digital pets are distinct in that they have no concrete physical form other than the hardware they run on.

Digital pets can be "simulations of real animals, as in the Petz series" Virtual pet sites are usually free to play and accessible to all who sign up.

They can be accessed through web browsers and often include a virtual community, such as Neopia in Neopets.

In these worlds, a user can play games to earn virtual money which is usually spent on items and food for pets.

One large branch of virtual pet games are sim horse games.

Interaction with virtual pets may or may not be goal oriented.

If it is, then the user must keep it alive as long as possible and often help it to grow into higher forms.

Keeping the pet alive and growing often requires 'feeding', grooming and playing with the pet.

If the interaction is not goal oriented, the user can explore the character of the pet and enjoy the feeling of building a relationship with it.