What is ConstraintLayout in Android?

ConstraintLayout allows you to create large and complex layouts with a flat view hierarchy (no nested view groups). It’s similar to RelativeLayout in that all views are laid out according to relationships between sibling views and the parent layout, but it’s more flexible than RelativeLayout and easier to use with Android Studio’s Layout Editor.

Intention of ConstraintLayout is to optimize and flatten the view hierarchy of your layouts by applying some rules to each view to avoid nesting.

What is Context on Android ?

The Context class is an Interface to global information about an application environment.

We may assume a Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. An Android app has activities. Context is like a handle to the environment your application is currently running in. The activity object inherits the Context object.