Five major types Determine the type of values: type key 1.string—string set get 2.hash—hash set get del incr decr incrby decrby incrbyfloat getrange append 3.list—list—doubly linked list lpush left lrange rpush right rrange lrange lpop rpop llen rlen lindex 4.set—set sadd scard spop 5.zset—sorted set zadd zscore key memer zrange zrevrange