LED Christmas and party string lights add a festive look to indoor or outdoor spaces. Also known as holiday lights, they provide temporary or semi-permanent accent lighting. Their LED bulbs or diodes sit along a flexible wire that wraps onto trees, loops around posts or railings, hangs over patios or between rafters, and more. Multiple strings of these holiday and party lights can join together and connect to an electrical outlet. LED lights typically last longer than other lighting technologies and use less energy to reduce operating costs.