Base isolators are devices used in building construction to protect structures from seismic activity. They work by allowing a building to move independently from ground motion during an earthquake, reducing the forces transmitted to the structure. This helps to minimize damage and enhance safety for occupants. Typically made from layers of rubber and steel, base isolators are placed between a building's foundation and its superstructure. They can absorb and dissipate energy, allowing the building to sway gently rather than rigidly. This technology is commonly used in earthquake-prone areas to improve the resilience of infrastructure.