The application is electricity in the home. Every light bulb, appliance, and wall-outlet in your house is in parallel with all the others.
If any electrical devices in your house were in series, then whenever you turned any of those off, they would ALL go off.
Also, the ones that needed the least power, like a night light, would get the most, and the ones that needed the most power, like the refrigerator, would get the least.
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"A ConstraintLayout is a ViewGroup allows you to position and size widgets in a flexible way. Note: ConstraintLayout is available as a support library that you can use on Android systems starting with API level 9 (Gingerbread)"