Uppercase letters are the larger, more prominent versions of letters. They are also sometimes called capital letters. Think of the letters at the beginning of sentences or in proper nouns (like names).
Lowercase letters are the smaller, less prominent versions of letters. They are the ones used for the rest of the words.
Here's an example:
* A (uppercase) and a (lowercase)
* B (uppercase) and b (lowercase)
* C (uppercase) and c (lowercase)
Why are they important?
* Clarity: Uppercase letters help distinguish proper nouns and sentence beginnings.
* Style: They can be used for emphasis or to make text look more formal.
* Communication: Proper use of capitalization is essential for clear and effective writing.
Let me know if you have any other questions!