Inkjet printing is one of the noncontact writing techniques, which provides a means for delivering desired volumes of ink precisely and repeatedly at predetermined locations on a substrate under digital control. The advantages of inkjet printing technology over MEMS techniques include, but are not limited to, low cost, additive patterning, maskless approach, rapid and scalable fabrication, and low material consumption. In this chapter, different approaches to inkjet printing will be discussed to understand the operating principles of inkjet printing. Then, the relationship between the inkjet-printed pattern's resolution and uniformity and the ink's interaction with substrates will be elucidated. Moreover, we summarize various ink materials and sintering methods for inkjet printing to develop high-performance electronic devices. Finally, we introduce examples of advanced inkjet-printed flexible and wearable electronics for various health applications such as biosensors, real-time health monitoring, implantable devices, and other sensors for physiological signals. © 2024 Elsevier Ltd. All rights reserved.