Most seasoned mutual fund investors don't pick one fund and stop there. They build a portfolio in two layers. The first layer, called the core, is made up of diversified equity funds meant to be held for years, forming the bulk of the portfolio. The second layer, the satellite, is a smaller allocation to funds with a sharper, more tactical purpose a specific theme, sector, or asset class that can add extra return or act as a hedge, without derailing the whole portfolio if it