What is a catch-all (wildcard) subdomain?
If you want a browser to be able to get to your site no matter what subdomain they requested (www.yourdomain.tld or even anyname.yourdomain.tld) without having set up specific directories or symlinks for those requests in advance, then you can use a catch-all subdomain to redirect their request for a non-existent, mistyped or random subdomain to a valid page on your website.
NOTE: A wildcard DNS record does not cover a root domain (e.g., yourdomain.tld), thus you will need to create a record for @ host additionally if needed. Also, if a separate subdomain is created, it has a higher priority than wildcard.
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