A logo is a graphic mark, emblem, symbol, or stylized name used to identify a company, organization, product, or brand. It may take the form of an abstract or figurative design, or it may present as a stylized version of the company's name if it has sufficient brand recognition.
Stationery is a broad term that encompasses business cards, envelopes, letterheads, labels, postcards, flyers, brochures, and other similar marketing emissaries. All of which, when designed professionally, can prove pivotal in making your brand shine.
Branding design describes how a brand chooses to visually represent their brand identity to the public. When talking about branding design, it typically refers to key brand elements such as the logo, color scheme, typography, and other design components that makes a brand stand out from competitors, an recognizable to consumers.