Language targeting allows you to tell search engines which domains, subdomains, subcategories, or site parameters are most relevant to users who speak a specific language. From the point of view of international SEO, language targeting is the best solution if the user’s location does not affect your site’s content.
At first glance, language targeting requires much less effort than geotargeting since you don’t need to develop new content. All you need to do is translate an existing page into any language and set language tags for Google and Bing, respectively.
The big problem with language tags is that, when done incorrectly, it is likely to prevent search engines from correctly indexing most of your content. It can have a significant impact on your traffic.