In UI design, a header serves as the topmost section, providing a consistent and easily recognizable area across different pages or screens. Its primary functions include:

• Branding and identity: It often contains the logo or name of the application, website, or company, establishing a sense of brand identity.
• Navigation: Headers typically include navigation elements like menus or links, guiding users to various parts of the UI efficiently.
• Accessibility and orientation: It helps users orient themselves within the application or website, often featuring search bars, user account access, or settings to enhance usability.
• Visual hierarchy: The header contributes to the overall visual hierarchy, separating different sections clearly and aiding in the organization of content.