Acorns
I recently came across an app called Acorns. In simple terms, it's a way to get involved with investing in the stock market for people who are either too disinterested or too busy (or both) to invest in the stock market via the traditional routes. You create an Acorns account, then connect your banking accounts (checking, credit, etc.), and the rest is automatic. Acorns will take your spare change from each transaction that you make and invest it on your behalf.
You can download the app on the Google Play store (for Android phones) or on iTunes (for Apple phones).

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