Some volatility could be healthy after the epic run most technology and AI stocks have enjoyed.Artificial intelligence has dominated the stock market since early last year. The Invesco QQQ Trust ETF (QQQ 1.31%), a popular technology-leaning exchange-traded fund (ETF), has been arguably one of the best stocks for AI-focused investors. The ETF tracks an index of 100 prominent companies trading on the Nasdaq, offering investors instant diversification.In other words, you don't have to pick specific AI stocks; ...