Mixed case
From Wikipedia, the free encyclopedia
Mixed case is the standard usage of upper-case and lower-case letters. Languages written in the Latin alphabet, the Cyrillic alphabet, and some others use upper-case letters to help the eye detect important words, such as proper nouns, or the first word in a sentence.
Writing titles or sentences in all caps seems childish to some, and in on-line communications can seem like shouting, so it is generally discouraged.