Every inkjet printer on the market has one thing in common: a print head. Small and large format inkjet printers all feature print heads that deposit ink on all of various types of media. Modern print heads contain chambers that get fed ink and tiny nozzles that spray out ink. Before print heads came around, prints were made on printing presses that made direct contact with the media. The process was often messy and expensive and the presses were very large. Modern print heads don't touch the media being printed on reducing mess and lowering the cost of printing. Inkjet print heads spray ink onto paper or other media in a controlled manner to produce the desired image.
Though they all do the same basic job, not all print heads are the same. Different manufacturers use print heads with different technology. Currently, there are two main print head types, each using a different method for spraying ink. The two types are Piezo and Thermal. While both are drop-on-demand print heads, the ways they move ink into and out of the print head are different.