Osteoporosis is a progressive skeletal disease characterized by a decrease in bone density and deterioration of the bone tissue's microarchitecture, leading to weakened, brittle bones and an increased risk of fractures. In normal bone structure, the body continuously breaks down old bone tissue and builds new tissue in its place; this process is called bone remodeling or bone turnover. In this cycle, cells called osteoclasts break down old bone, while cells called osteoblasts produce new bone material. In osteoporosis, however, new bone formation cannot keep pace with the rate of old bone breakdown, resulting in a net loss of bone mass. This condition reduces bone strength, leading to easy fractures even from minor falls or during daily activities.