What is the difference between crawlability and indexability?

Crawlability and indexability are two distinct concepts in SEO, although they are closely related:

1. **Crawlability**:
   - Crawlability refers to the ability of search engine crawlers to access and explore the pages of a website.
   - A website is considered crawlable if search engine bots can navigate through its structure, follow links, and discover its content.
   - Factors that affect crawlability include website architecture, internal linking, robots.txt directives, server responsiveness, and crawl errors.
   - Improving crawlability ensures that search engines can efficiently discover and crawl all the pages on your website, leading to better indexation and visibility in search results.

2. **Indexability**:
   - Indexability refers to the ability of a web page to be included in a search engine's index.
   - Even if a page is crawlable, it may not necessarily be indexed by search engines if it is deemed low-quality, duplicate, or irrelevant.
   - Factors that affect indexability include content quality, relevance, uniqueness, canonicalization, and the presence of noindex directives.
   - Improving indexability involves creating high-quality, unique content, optimizing metadata, using canonical tags, and avoiding duplicate content issues.
   - Indexed pages are those that search engines have deemed worthy of inclusion in their search results and are therefore eligible to appear when users search for relevant queries.

In summary, crawlability focuses on whether search engine bots can access and explore the pages of a website, while indexability focuses on whether those pages are deemed worthy of inclusion in a search engine's index. Both aspects are important for ensuring that your website's content is effectively discovered, crawled, and ranked in search results.