An interior designer is a professional who blends art and science to create functional, safe, and aesthetically pleasing indoor environments that protect and respond to human needs. They go beyond simply decorating a space with colors and furnishings; they are involved in the multifaceted process of conceptual development, space planning, site inspections, programming, and construction management.

Utilizing a broad set of technical knowledge, interior designers must have a working understanding of structural requirements, building codes, accessibility standards, and sustainable design principles. They collaborate with architects, engineers, and contractors, often using sophisticated 2D and 3D computer-aided design (CAD) software to communicate their vision effectively. The ultimate goal is to produce a coordinated and harmonious whole, ensuring the architecture, function, and visual elements are unified and appropriate to the activities pursued in the space.