Bonjour petit ami! A long, long time ago, English and French were two different languages, and they didn't look or sound anything like each other. But the people who spoke English and the people who spoke French lived in the same place, and they talked to each other a lot.
Eventually, some of the French words started to sneak into the English language. The English people changed how they said the French words a bit so they would sound more like English, but they still used a lot of French words.
For example, the French word "table" (pronounced ta·bl) became "table" in English (pronounced ta·ble). The French word "chaise" (pronounced shayz) became "chair" in English (pronounced chair).
Over time, even more French words started to show up in English, especially when it came to fancy-sounding things like foods, clothes, and art. French was considered a super fancy, high-class language, so when people wanted to sound fancy, they would use French words.
Even today, there are still lots and lots of French words in the English language. But the English words we use every day are still mostly English, with just a little bit of French influence.