Modern electronic breadboards typically don't require soldered components. Their connections are therefore temporary, meaning users can switch them in and out quickly and easily if they need to revise or correct something.
Breadboards are used most commonly in prototyping applications. The fact that solderless breadboards don’t require circuitry components to be affixed semi-permanently to the surface of a PCB makes it much easier and quicker to manoeuvre and swap them until you achieve the desired effect. This is ideal for both experimental design and rigorous testing of electrical circuits. The hot-swappable component functionality of breadboards makes them a hugely convenient piece of equipment in the prototyping stages of circuit design and development.
As well as being considerably more economical in terms of both time and expense, the use of breadboards has the added advantage of making diagnostic and debugging work far more straightforward.
Solderless breadboards are ideal for technical analysis applications. Breadboarding a circuit allows electronics engineers to quickly replicate a real-world PCB found in an existing product or system. This can be especially useful in helping identify likely points of electronic fault or failure in a given circuit, without having to waste time and money making incremental or experimental adjustments to a fully soldered board in a complete but malfunctioning product. A single misplaced lead in a sprawling and complex circuit can cause the entire system to behave oddly (or stop working altogether). It's extremely useful to see exactly where each component pin is placed without guesswork or incorrect soldering slowing things down!