To ensure a logo is memorable and recognizable, it should be simple, distinctive, relevant, and scalable, with carefully chosen colors and legible typography. Designing for a global audience requires cultural sensitivity, universal symbols, appropriate color meanings, and legal considerations, ensuring the logo resonates universally. Companies should consider updating their logo every 5-10 years or in response to brand evolution, market trends, significant milestones, or technological changes. However, updates should maintain elements of the original design to preserve brand recognition.