For example you have a class called Student, which has three fields.
You can create a POJO class for this, but you need to add some extra code to make it Parcelable. Have a look at the implementation.
Once you have created this class, you can easily pass objects of this class through the Intent like this, and recover this object in the target activity.
Here, the student is the key which you would require to unparcel the data from the bundle.
This example shows only String types. But, you can parcel any kind of data you want. Try it out.