• Redis provides atomic operations on keys
• Keys can have TTL (-2 expired, -1 never expire, n seconds to expire)
• Values are stored as a list.
  • The list is indexed and can be queried with ranges.
• List items can be popped, Left/Right pushed.
• Values can also be stored as set.
  • Set operations: add, remove, is_member, members, union
• Values also support sorted sets, using a user defined sorting key
• Another value type is Hashed values.
  • key : {key: value, key:value}
  • HSET user name "test" address "earth"
  • HGET user name
  • Atomic operations are available on hash values too.
• Keys can optionally follow a schema.
  • usr:123:id
  • An O(N) search is possible on a prefix of the key

Reference

• http://try.redis.io