Perovskite–perovskite tandem solar cells exhibit a cutting-edge performance in optoelectronics technology, promising to revolutionize the photovoltaic community with their tunable bandgaps, exceptional efficiency and potential for cost effective production. In this chapter the principles, unique material characteristics and the functioning of perovskite solar cells (PSC) were explored. The design and structure of tandem setups is such that, two perovskite layers with different bandgaps are layered to enhance light absorption and charge collection capabilities over a larger range of the solar spectrum. The chapter also reviews recent accomplishments, stability studies and scalable manufacturing methods for tandem devices and the advancements made in power conversion efficiencies, surpassing 30% recently. This chapter also presents case studies of appreciable effective perovskite–perovskite tandem solar cells and their ongoing research, commercialization and development of this these solar cells for day to day industrial uses. PSCs may become favorable choice for high quality solar cells due to their higher absorption spectrum (~2.23 eV) when compared to their silicon counterparts (~1.48 eV). The flexibility in adjusting the bandgap of perovskite–perovskite materials enables the optimization of tandem cell architectures, further enhancing their performance. Various methods to enhance the carrier diffusion length of narrow bandgap cells and reduce voltage loss in wide bandgap cells is also discussed. Perovskite–perovskite tandem solar cells have different challenges such as stability and degradation problems, interface engineering difficulties, lead toxicity issues, and scalability obstacles. The challenges, current approaches and future research directions to address them are discussed for rapid commercial deployment.