When we speak of the stock market we describe it with the term “The Stock Market”, as if it’s a single, unified market.
The reality is nothing close.
The stock market is really a group of sub-markets, many of them very different from the rest. These sub-markets are commonly described as “sectors” and there are quite literally dozens of them.
Since sectors perform differently in various market conditions, it’s worth using them to your advantage in building your portfolio.