# How can we help?

## Search

Cordial offers a variety of useful link functions for use in messages. These functions include:

- [Optout link](https://support.cordial.com/hc/en-us/articles/115005855988): an unsubscribe link that is added automatically to each message.
- [Adding tags to links](https://support.cordial.com/hc/en-us/articles/115005692027): allows you to tag links for searching and audience building.
- [Naming a tracked link](https://support.cordial.com/hc/en-us/articles/115005692067): a "friendly name" for links that display in analytics reports.
- Link appends ( [using Smarty](https://support.cordial.com/hc/en-us/articles/115005856068) or [via UI](https://support.cordial.com/hc/en-us/articles/360036016771)): adding a query string to links.
- [Link appends by content section](https://support.cordial.com/hc/en-us/articles/360043098751): add appends to links in specific sections of your message.
- [Adding a contact to a list](https://support.cordial.com/hc/en-us/articles/115005692127): changes list association when clicking a link.
- [Updating a contact attribute](https://support.cordial.com/hc/en-us/articles/360000323732): changes a contact attribute when clicking a link.
- [Disable link tracking](https://support.cordial.com/hc/en-us/articles/115009266788): turns off link tracking for an individual link in a message.

To avoid redirect errors, please always use a protocol (http:// or https://) in links.

Link tracking is supported for telephone links using the `tel:` and `sms:` protocols.

In the next article, you can [learn about the optout link](https://support.cordial.com/hc/en-us/articles/115005855988).