Create sitemap feed for better visibility, unlimited no. of products, categories, custom links, etc. Better thing is use of XLS styles for better human readability, also includes product images count.

Website offers content in multiple languages, Opencart do support this mechanism, you do add translation for products description and other content and this cover up potentials buyers, however, when time to submit sitemap feed to Google or any other search engine a limitation hold you back by forcing you only one default language, drawback is leaving behind all potential customers as product and content is not visible unless provided to search engine.

To leverage customers from different localities this extension allows generating sitemap feed in multiple languages, all active languages on website.
Apart from product there is coverage of categories, manufacturers, information pages, etc. If Journal3 theme is active then Blog and Blog Categories also covered up.

XML feed files basically use by search engines Google, Bing, Yandex, Yahoo, Etc. in order to learn about content of website offers, *search engines love images too, thus product images links also generated in feed.
Eliminate manually Sitemap XML and shift for dynamically created one ensuring sitemap is always updated without human intervention. This also let search engines know about new products links that needs to be indexed.