A typewriter was a writing machine that produced characters similar to typeset print by means of a manually-operated keyboard that actuated a set of raised types, which struck paper through an inked ribbon.
During the 1950s, most science fiction writers had to utilize typewriters. Benny Russell owned a Smith Corona brand typewriter. (DS9: "Far Beyond the Stars") When Dr. Wykoff told him that "people who are fine don't write on walls", he asked for a typewriter instead. (DS9: "Shadows and Symbols")
In 1968, Roberta Lincoln was surprised by the typewriter in Gary Seven's office, which instead of needing manual input like all typewriters of the day, was able to type what was spoken and was even able to interpret the context of the conversation. (TOS: "Assignment: Earth")