DMARC is the third authentication record you add when verifying a sending domain. Beyond protecting your domain from spoofing, DMARC can generate aggregate reports about which servers send mail as your domain and whether that mail passes SPF and DKIM alignment.
When your DMARC record points its reporting address to Ariyes, those aggregate reports are collected for your domain. Reviewing them helps you confirm your authentication is set up correctly and spot any unexpected senders using your domain.
Don't let DMARC reporting intimidate you. The essential thing at first is simply that DMARC is present and verified on your sending domain — that's covered when you add and verify the domain. Reading reports is a refinement you can grow into as your sending scales.