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Practical Electronics/Breadboard
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
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The breadboard (also called a protoboard) is used to create circuits without soldering components together. The pins are connected vertically along the grey and red lines and horizontally in the sections in between. Note that they do not connect across the gap in the center.
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Further reading
breadboard
Practical Electronics/Plugins
mechatronics design wiki: "Using Solderless Breadboard"