A meta tag analyzer is a tool used to analyze the meta tags of a webpage. Meta tags are HTML tags that provide information about a webpage, such as its title, description, and keywords. The purpose of meta tags is to provide search engines with information about the content of a webpage, which can help with indexing and ranking.

Meta tag analyzers scan a webpage for its meta tags and provide a report on the information contained within them. Some common meta tags that are analyzed include:

1. Title tag: This is the text that appears in the title bar of a web browser and is also used by search engines to understand what the page is about.

2. Description tag: This is a short summary of the content on the page, which appears in the search engine results.

3. Keyword tag: This tag contains a list of keywords related to the content on the page, which can help with search engine optimization.

4. Robots tag: This tag tells search engines whether to index or follow links on the page.

Meta tag analyzers can be useful for website owners and SEO professionals who want to optimize their website's meta tags for better search engine visibility. By using a meta tag analyzer, they can identify missing or poorly optimized tags and make improvements to their website's metadata.