ELI5: Explain Like I'm 5

Letter (alphabet)

A letter is a special symbol that represents a sound in words. Just like you use Lego blocks to build a tower, when you want to make words, you use letters. There are 26 letters in the English alphabet. Each letter has its own name and sound. For example, the letter A makes the “aah” sound, like in the word apple. When you put different letters together, they make different words, just like Lego blocks can make different towers. You can use letters to write down your name, make a shopping list, or even write a story. So next time you see a letter, remember that it’s just like a special building block for words.