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Hi there @pmjchan,

We use IP Geolocation when gathering the location data of the profiles in your account. When someone clicks through a Klaviyo email, subscribes via a Klaviyo signup form, or are otherwise captured by our web tracking snippet, we will identify the person and use the IP they are on to set his/her location. Based on this data, you are able to segment profiles according to their location, thus using the appropriate language for the emails they will receive. 
Another way you can target profiles with different languages is by creating a separate signup for each region you are trying to target. you can have the signup forms be a different language and also have those profiles go to a specific list that is for that language. For example, you can make a sign up that is in Spanish, that will only show in Mexico or Spain, and you can have the profiles that sign up to it added to a "Spanish List" and have a Spanish Welcome Flow sent out to those members. 

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Another thing you can do is give people the option to choose what language they want to sign up for on the signup form and make different flows for each language that is available.
Here are some documents that explain these further:
When and How Klaviyo Sets a Profile Location
Creating a Location Based Segment
Klaviyo's Support for Multiple Language

Hope this helped,

Alex