XML (eXtensible Markup Language) is a markup language used to define document structures with a focus on data representation. Here are some common XML terminology definitions with examples:
### 1. Elements
Elements are the fundamental building blocks of XML. An element consists of a start tag, content, and an end tag. Elements can also be nested within other elements.
**Example:**
```xml
<note>
<to>Tove</to>
<from>Jani</from>