Last modified on Mon 19 Feb 2024

Internationalization is the process of providing multiple language support to software, in this case WordPress. It's often abbreviated as i18n, where 18 stands for the number of letters between the first i and the last n.

All text strings in a project have to be internationalized using the localization functions from WordPress core. You can also check out this great guide to internalization in WordPress by Samuel Wood.

Official docs:

I18n for WordPress Developers