Stairs are a series of steps designed to allow people to move between different levels of a building or structure. Stairs typically consist of:

• Treads (the flat part you step on)
• Risers (the vertical parts between steps)
• Stringers (the structural supports on the sides or underneath)
• Handrails (for support and safety)

Stairs can be made from various materials like wood, metal, concrete, or glass and come in different styles, such as straight, spiral, or floating. They're essential for accessibility and movement in multi-level spaces.