A string is like a special kind of necklace where each bead is a letter, number, or symbol. When you put these beads together, they make a word or a sentence. Just like how you can make different patterns with beads to create a necklace, you can arrange letters and symbols in different ways to make words and sentences.
Think of a string as a long train where each car holds a letter or symbol. The train cars are linked together in a line, just like letters in a word. If you change the order of the train cars, you change the word or sentence they make, just like rearranging the cars on a train track.
A string can also be seen as a line of colorful flags hanging on a rope. Each flag has a letter or symbol on it. When you look at the flags from left to right, they form a word or a message. If you move the flags around, you change the message they show, just like how changing the order of letters in a string changes the word or sentence.