How to train a cat to toilette inside home?

If a cat owner lives in an apartment and if there is no place for a cat to poo outside, then what is the option? Cat products are not available in my country. So is it possible to manage this inside home?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).