&gt;So electronic trading is what?<p>That great innovation where you no longer have to shout in a pit to get your trade executed because, you know, computers.<p>Virtually all trading these days is electronic.<p>&gt;And HFT is<p>Algorithmic trading by computers that&#x27;s &quot;fast&quot; (usually regarded as sub-second trading, although definitions vary a little).<p>The more you know...