It can be anything! An apex, subdomain, or even a URL.

Results forwww.dataannotationtool.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-12-12T09:31:35.648	2021-12-12T08:31:35	2022-03-12T08:31:34	www.dataannotationtool.com	www.dataannotationtool.com	C=US, O=Let's Encrypt, CN=R3
2021-12-12T09:31:35.408	2021-12-12T08:31:35	2022-03-12T08:31:34	www.dataannotationtool.com	www.dataannotationtool.com	C=US, O=Let's Encrypt, CN=R3
2021-12-04T00:54:55.137	2021-12-03T23:54:54	2022-03-03T23:54:53	www.dataannotationtool.com	www.dataannotationtool.com	C=US, O=Let's Encrypt, CN=R3
2021-12-04T00:54:54.95	2021-12-03T23:54:54	2022-03-03T23:54:53	www.dataannotationtool.com	www.dataannotationtool.com	C=US, O=Let's Encrypt, CN=R3