A tape recorder is a device that captures sound by storing it on magnetic tape, then plays it back later. Before computers and smartphones, tape recorders were a main way many people recorded voices, music, and other sounds.

Here's how it works: the tape is a thin ribbon of plastic coated with magnetic material, wound on two reels inside a cassette or on open spools. When you speak into the microphone, the recorder converts sound waves into magnetic patterns on the moving tape. To hear what you recorded, the machine reads those patterns and converts them back into sound through a speaker.

Tape recorders were revolutionary when they became popular in the 1960s and 1970s. Students used them to record lectures. Musicians recorded songs in studios. Journalists interviewed people and preserved people's exact words. Families captured children's voices and special moments. You could mail a recorded tape to relatives far away, almost like sending your voice through the mail.

Today, digital devices have mostly replaced tape recorders, but people still talk about recording sound, even if it's no longer stored on tape.