How can I send a letter to international countries?

I would like to send a letter to Thailand, but I don't know how to send it. I have a friend in Thailand and I would like for my friend to send mail to me too. How would I give my address to my friend so they can send me letters and I can send them letters?

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��).