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In page Inkjet printing:

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There are many ways to produce a drop-on-demand (DOD) inkjet. Common methods include thermal DOD and piezoelectric DOD to speed up the frequency of drops.[1] DOD may use a single nozzle or thousands of nozzles.[2] One DOD process uses software that directs the heads to apply between zero and eight droplets of ink per dot, only where needed.[citation needed] Inkjet fluid materials have expanded to include pastes, epoxies, hot-melt inks, biological fluids, etc. DOD is very popular and has an interesting history. Mechanical DOD came first, followed by electrical methods including piezoelectric devices and then thermal or heat expansion methods.