What is the purpose of colons within Redis keys?

@jakob 

The purpose of colons within Redis keys is to delimit sub-sequences or fields within a key. This allows for a hierarchical organization of keys, enabling more complex data structures to be stored within Redis. For example, a key with the format "user:123:profile" might represent the profile data for user with ID 123. The first field "user" could represent the top-level category for all user-related information, while the second field "123" could represent the specific user ID, and the third field "profile" could represent the specific type of data stored for that user.