 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, Jurij Koruza, Jitka Hreskak, and others.