> [!tldr] **Uniform Resource Identifier - unambiguous reference to a resource (which can be anything, really)** URI is short for Uniform Resource Identifier. It’s a generalization of the concept of a “URL”. Whereas a URL refers to a _Location_ on the internet, a URI unambiguously refers to a generic _resource_. This could be a website, or simply a dataset, image, or anything else. URIs function like [[UUID]]s, but typically have a more hierarchical structure. They also must exist within a given [[Namespace]]. [[URIs don't get enough credit]]. **Common URI schemes your phone understands:** - `http://` / `https://` — Opens a web page - `mailto:` — Opens email composer with a recipient - mailto:[email protected] - `tel:` — Initiates a phone call - `sms:` — Opens text message composer - `geo:` — Opens maps to a location - geo:37.786971,-122.399677 - `ftp://` — File transfers - `ssh://` — SSH connections **** # More ## Source ## Related - [[UUID]] - [[Namespace]]