 The potassium sodium niobate, KNN, a lead-free material, is a promising candidate for replacing PZT in applications such as sensors and actuators due to its environmental friendliness and high efficiency. However, producing pure KNN ceramic with a high density and a uniform, fine-grained microstructure is challenging. This review discusses various methods used to produce KNN ceramics, including solid state synthesis, sintering, and special sintering techniques. Solid state synthesis produces KNN powders with low densities and large grain sizes, while sintering requires careful control over temperature and atmosphere to achieve optimal results. Pressure-assisted sintering and spark plasma sintering have shown promise in achieving higher densities than traditional sintering methods. This article was authored by Barbara Malik, George Caruza, Jitka Freskak, and others.