Decor (or sometimes décor, with an accent borrowed from French) is the style and arrangement of furnishings, colors, and decorative objects in a room or building. When you walk into someone's home and notice the paintings on the walls, the colors of the curtains, the style of the furniture, and how everything is arranged, you're seeing their decor.

Decor reflects personal taste and creates a particular mood or atmosphere. A classroom might have bright, cheerful decor with colorful posters and student artwork. A fancy restaurant might have elegant decor with dim lighting, tablecloths, and paintings. Your own bedroom's decor might include posters of things you love, the color you painted the walls, and how you've arranged your books and belongings.

People sometimes hire interior decorators to help plan the decor of their homes or offices. These professionals understand how colors, textures, and arrangements can make spaces feel cozy, energetic, calm, or professional. When someone says a room has “great decor,” they mean the visual elements work well together to create an appealing space.