Information architecture refers to the process of structuring and organizing the content on a website or an application to improve the user journey. This information architecture involves the complete design of the user journey. The navigation bars and other elements also come into it.
If the information architecture is well organized, it helps the user quickly look for what they are searching for. It also increases the crawl rate and indexing of the content. This helps the website to get good visibility and rank better on the search engine result pages.