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+Returns the internal encoding for the Redis object stored at `<key>`
+
+Redis objects can be encoded in different ways:
+
+* Strings can be encoded as: 
+
+    - `raw`, normal string encoding.
+    - `int`, strings representing integers in a 64-bit signed interval, encoded in this way to save space.
+    - `embstr`, an embedded string, which is an object where the internal simple dynamic string, `sds`, is an unmodifiable string allocated in the same chuck as the object itself.
+      `embstr` can be strings with lengths up to the hardcoded limit of `OBJ_ENCODING_EMBSTR_SIZE_LIMIT` or 44 bytes. 
+
+* Lists can be encoded as `ziplist` or `linkedlist`. The `ziplist` is the special representation that is used to save space for small lists.
+* Sets can be encoded as `intset` or `hashtable`. The `intset` is a special encoding used for small sets composed solely of integers.
+* Hashes can be encoded as `ziplist` or `hashtable`. The `ziplist` is a special encoding used for small hashes.
+* Sorted Sets can be encoded as `ziplist` or `skiplist` format. As for the List type small sorted sets can be specially encoded using `ziplist`, while the `skiplist` encoding is the one that works with sorted sets of any size.
+
+All the specially encoded types are automatically converted to the general type once you perform an operation that makes it impossible for Redis to retain the space saving encoding.
+
+@return
+
+@bulk-string-reply: the encoding of the object, or `nil` if the key doesn't exist