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Corbin Crutchley
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content/blog/what-are-react-server-components/index.md
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}
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# What is Reconciliation?
OK now "reconciliation"
Eventually React needs to know what needs rendering and what doesn't
So, for example, say you have:
```
- List item 1
- List item 2
```
And want to add an item to the list. You ideally don't want React to have to re-render items 1&2, because it's expensive
By default, it will do that
But, if you add a `key` in a list, React is able to figure out what elements associate with what keys and prevent a re-render
![](https://media.discordapp.net/attachments/609441345223917590/1166186746149617794/image.png?ex=658a2c8a&is=6577b78a&hm=db491f9296ee74611891edbcb4af7c4be585a737ef7a62e93a9fd15255f71077&=&format=webp&quality=lossless&width=2879&height=1003)
-----------------------------------------------------------------
# What is SSR?
// Done