You could say that DNSSEC is the internet traffic police, ensuring that all data traffic is authorised and encrypted. It helps avoid security issues, such as being redirected to a fake website.
HTTPS gives your users a safe and secure connection to your website. It is recognisable by the padlock in your web browser.
DMARC, DKIM and SPF
DMARC ensures that an email comes from the correct email server, and that it is not manipulated along the way.
STARTTLS og DANE
The DANE standard is an extra security check of both web and email. DANE is an identity verification tool that double-checks whether everything is as it should be.
The internet only works when PCs, servers and a great deal of other devices can find each other. They do this via IP addresses.
With these options you can activate browser mechanisms to protect visitors against attacks with e.g. cross-site scripting (XSS) or framing.