A mutual fund is a type of financial instrument consisting of a pool of capital collected from many individual investors to invest in securities like stocks, bonds and other assets.
In the above sentence, the conjunction and joins series of items together. The pool of capital is invested in a series of items: Stocks, bonds and other assets.
Under a policy established by the Ministry of Health, Labor and Welfare, people with mild cases are asked to stay at home..
Here, and joins series of items or series of name of governmental departments.