This animated video explains what 3D bioprinting is and how it works. I explain 3D bioprinting methods and applications in detail: I discuss bioinks; the three categories of bioprinting (extrusion-based bioprinting, droplet-based bioprinting, and energy-based bioprinting); cross-linking and why it is important; the subcategories of bioprinting, including inkjet-based bioprinting, microvalve-based bioprinting, laser-induced forward transfer (LIFT) bioprinting, and stereolithography; why bioprinting is sometimes referred to as 4D bioprinting; what hydrogels are and how they resemble the extracellular matrix; applications of bioprinting, including bioprinting organs and tissues (potentially even personalized organs with the help of stem cells), bioprinting vegan meat and leather, developing and testing new drugs or cosmetics with organs-on-chips; and the ethical questions related to bioprinting. I hope you enjoy the video and find it informative!