Tech Bubble is a type of speculative bubble, a rapid share price growth of technology stocks. The increased speculation leads to a radical increase in stock prices.
Additional meaning of Tech Bubble:
When a tech bubble starts, many investors think that there's a unique opportunity to earn big capital gains, therefore they buy shares at prices that normally would be considered too high. Like other market bubbles, a tech bubble will eventually burst. If the bubble has grown too large, the bursting can trigger a minor recession.