DNS Wildcard set up on A record vs cname. Are they the same thing?

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Using Yunohost on old computer with my own domain.

I have an a wild card set on an A record ( *.my-ip-addr) for my domain. When I install an app on a domain ie social.my.tld do I still set up a cname record for social.my.tld?
Im not sure of the difference. I always thought that the * meant to be a wildcard for subdomains.

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