How to create multi-country sites or multi-language sites jumper like this?

[JASHEN]

Hello everyone,

We have different Shopify stores in different countries, for example

MYBARND.com MYBARND.de MYBARND.ca MYBARND.com.au

but now they haven’t been connected.

I want our site similar to this site I show below, could anyone provide some INFOS about how I can do it, much appreciated.

There is a selector in the footer,

once you click it, there will be a temp area for choosing the country or the region.

[JASHEN]

example site:

https://us.roborock.com/

https://us.tineco.com/