The quick brown fox jumps over the lazy dog

Okay kiddo, let me break it down for you. There's this thing called the alphabet, and it has 26 different letters in it. The sentence "the quick brown fox jumps over the lazy dog" is a sentence that uses every single one of those letters at least once.

So, imagine you have a bunch of toy blocks with each letter of the alphabet on them. You want to make a tower with all of the blocks, but you don't want any of the letters to be left out. That's kind of like how this sentence uses every letter of the alphabet.

Now, in the sentence there are two animals: a fox and a dog. The fox is very quick and the dog is very lazy. So, the fox jumps over the lazy dog. That means the fox jumped over the dog without touching it. Just like how you might jump over a puddle of water so you don't get wet.

So, to summarize: "the quick brown fox jumps over the lazy dog" is a sentence that uses every letter of the alphabet and tells a little story about a fast fox jumping over a lazy dog.