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+# Statelessness & Immutability
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+# The Document Model
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+A big difference between Slate and other rich-text editors is that Slate is built on top of a nested, recursive document model—much like the DOM itself. This means you can build complex components like tables or nested block quotes, just like you can with the regular DOM.
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+Slate's model is split up into a series of parts:
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+#### Nodes
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+Just like the DOM, Slate's content is built up of a tree of nested nodes. There are four different types of nodes. At the very top you have a **document** node. At the very ends you have **text** nodes. And in between you have a varying amount of **block** and **inline** nodes.
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+###### Document
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+The **document** node is the top-most node of Slate's content. It serves as a wrapper for all of its child nodes.
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+A **document** node can only have **block** nodes as its direct children.
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+###### Blocks
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+**Block** nodes, just like in the DOM, are block-level pieces of content—for example, things like paragraphs, quotes, list items, etc. They can have any combination of other **block** nodes, or **inline** and **text** nodes as their children. 
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+###### Inlines
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+**Inline** nodes, also like in the dom, are inline-level pieces of content—for example, things like links, hashtags, etc. However, this does _not_ include things like bold, italic or underline. For formatting, Slate uses another concept called [Marks](#characters-marks).
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+**Inline** nodes can have any combination of other **inline** nodes or **text** nodes as their children, just like in the DOM.
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+###### Text
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+**Text** nodes are the leaf nodes in Slate. Every branch of the document will always end in a text node, even if it's empty.
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+#### Characters & Marks
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+#### Selection
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+#### State
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+####