A partnership is formed when two or more people agree to contribute money, property, or skills to a common business venture and share the profits. Key differences from a corporation include partnerships having no set lifetime, partners having unlimited personal liability for business debts, and easier formation with fewer legal requirements. Partnerships offer advantages like not paying taxes as a separate entity and fewer regulations compared to corporations. However, partnerships also have disadvantages like potential responsibility for another partner's decisions and difficulty replacing an essential partner.