You got them because 3M makes a huge range of really wonderful, easy to use, connectors for a wide range of tasks. They want to give them to you so that you will use them on servo and sensor lines, rather than using hobby level parts.
They want you to be so thrilled with their connectors that the next time you need a connector you Google "3M connector to ...." and find the perfect 3M connector. A connector that is in your new device that you are planning to sell millions of.
The really are nice, sturdy connectors that can be crimped on the wire with pliers. Perfect for your robot.
Quote:
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3M™ Link Connectors - industrial grade discrete wiring solution for servo motors, controllers, and sensors
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from the first line of the Digikey link
Good luck!