Security improvements- Ad trackers that constantly bombard users with advertisements when they show interest in a product will now be blocked by the macOS.

With the new Markup feature, photos and PDFs can now be cropped or rotated.

Quick Look- A pre-existing app on macOS Sierra, Quick Look allows users to see files, folders or photos without even opening them.

Additionally, users will now be able to be aware of details about the document or images such as the date of document creation or the kind of lens used for taking a photo.

Finder Preview Panel- Like before,this feature allows the user to have a small glance into a document or an image without actually opening it.

The user can explore the kind of actions that they can perform by checking out the Quick Actions menu.

Finder Quick Actions- This is a useful feature that will allow users to create a PDF or rotate an image without the use of an app.Here are some of the features that were introduced in Mojave and some of the pre-existing ones that have been reworked:

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