Mixed case
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Mixed case is the standard usage of upper case and lower case letters. Languages written in the Roman alphabet, 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.
Note: writing titles or sentences in ALL CAPS seems childish to some, and in on-line communications seems LIKE SHOUTING, so it's generally discouraged. Likewise, writing using no or few caps is also discouraged, as it hinders readability.