No, ext2 does not have journaling support. This wasn't added to ext until ext3.

Quite simply, because Windows hasn't been programmed to recognise ext-type filesystems. Out of the box, Windows won't be able to identify ext3 and ext2 filesystems, and will probably consider them corrupted. Fortunately, you can install a driver for ext2 and ext3 filesystems into most versions of Windows. It's called ext2 IFS, and is linked below. With this driver installed, you can mount most ext-type partitions as ext2. (NOTE: ext3 is technically not supported. This means that using ext2 IFS will disable journaling, as that's the main difference between ext2 and ext3)

The normal common file system is ext2 or 3.

ext4 supports a feature called 'journalling' which prevents filesystem corruption in the event of a power failure or system crash. When you are certain you don't need it, you can choose ext2. But for the vast majority of users, ext4 is the best option.

The ext2 file system was a common file system for Linux systems. It has been supplanted for the most part by ext3 and ext4, which are backwards-compatible with it. It is still used on USB drives since it is not journaled, reducing the number of writes made to the drive (but thus increasing corruptibility).