What is the key advantage of server-side rendering for SEO?

Server-side rendering (SSR) offers a significant advantage for search engine optimization (SEO) by making the HTML content directly available to search engines when they crawl a website. This is crucial because search engines rely on the content available in the HTML at the time of crawling to understand and index the page.

When a web application uses client-side rendering, the initial HTML sent to the user may be minimal, and the content gets generated dynamically via JavaScript after the page loads. This can pose challenges for search engines, as they might struggle to execute the JavaScript and fully render the page before indexing it. In contrast, with server-side rendering, the server generates a fully populated HTML page before it reaches the user's browser or the search engine bot.

Consequently, having complete HTML content available at the time of crawling helps search engines accurately index the content, improving the visibility and rankings of the website in search results. This is particularly important for SEO, as it ensures that all relevant information is readily accessible and can be properly analyzed by search engines.