=== Mysql Master-Slave Replication ===
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Important information:
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**//Binary Logs//** -->
Replication events are written to the binary logs (on the master). Information stored here will be read by the slave later.
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**//Relay Logs//** --> Simply a copy of the binary logs. Relay logs are stored on the slave. 
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=== IO Thread ===
Slave connects to master, copies the binary logs over and stores them locally in relay logs.
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<code>
+------------------+              +------------------+
+--------+         |              +---------+        |
|MySQL   | -----   |              |MySQL    |        |
|Master  |     |   |              |Slave    |        |
+--------+    \/   |     IO       +---------+        |
|      Binary Logs | <--------->  |Relay Logs        |
+------------------+              +------------------+
</code>
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=== SQL Thread ===
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This thread reads events from the relay logs stored locally on the slave and applies them. 
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<code>
+------------------+
+---------+        |
|MySQL    | <---+  |
|Sla^e    |     |  | SQL Running
+---------+     |  |
|Relay Logs +---+  +
+-----------------+
</code>
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More information can be found: [[https://www.percona.com/blog/2013/01/09/how-does-mysql-replication-really-work/]]