This derives from the French word "facade" which means front. You can use this word in English to describe the front of a building. You can also say this word to mean illusion or appearance. For example, "she has this facade of a rich girl, driving a BMW and acting snobby. But she actually works three jobs to pay for all her expenses"

Literally, a facade is the front of a building, constructed to make the buiding look larger. Usually, a facade means a false image that a person projects to mask their real feelings or intent. "He looked calm, but Sally knew that it was just a facade. Inside, he was terrified that someone would find out about his mistake." "She acts sophisticated, but it's only a facade. She really is not well-read and knows nothing about art."