Restore Safari browser on MacBook Air Yosemite OSX 10.10.4
Many who are new to the Mac and OS X mistakenly think they have deleted something if they accidentally or purposely remove a icon from the Dock.

If that is what you have done, restoring it to the Dock is easily done.


Find your Applications folder
Locate Safari
Drag to the dock


Or, double click on it and it will open.  There you can pin it to the Dock. By long pressing the icon or right clicking and select options.  See screenshot below.  The other way to keep it there is simply to drag it to a new location on the Dock closer to the Finder icon.

If you dragged it to the Trash from the Applications folder, the open the trash folder by double clicking on it and restoring from there.

If you truly deleted it, which is very hard to do "accidentally", a restore of your OS may be in order.