Thrips are minuscule insects that can infest houseplants, causing visible damage such as silvery or brown spots, distorted leaves, and wilting. They thrive in dry, poorly ventilated environments and are often introduced via infested plants. Prevention measures include proper ventilation, humidity, and spacing, while treatment options include insecticides, insecticidal soaps, and biological control. Regular monitoring and follow-up treatments are crucial to ensure complete eradication and protect plant health.