Passive Management

What Does Passive Management Mean?
A style of management associated with mutual and exchange-traded funds (ETF) where a fund's portfolio mirrors a market index. Passive management is the opposite of active management in which a fund's manager(s) attempt to beat the market with various investing strategies and buying/selling decisions of a portfolio's securities.

Also known as "passive strategy," "passive investing" or "index investing." 

Investopedia explains Passive Management
Followers of passive management believe in the efficient market hypothesis. It states that at all times markets incorporate and reflect all information, rendering individual stock picking futile. As a result, the best investing strategy is to invest in index funds, which, historically, have outperformed the majority of actively managed funds.