A comment is a reader's response to an article in a blog. Comments appear on the article page in reverse chronological order, typically after the article body. Just as a blog can have any number of articles, an article can have any number of comments.
Article comments are a target for spammers, so Shopify blogs use a spam detection system to identify comments that are likely to be spam. Shop owners can also can mark comments as spam or not spam. Comments that are marked as spam are removed from the Shopify admin and don't appear in the blog.
What you can do with Comment
The Shopify API lets you do the following with the Comment