No.
Ashampoo Burning studio is one of the best softwares.
Dvd+r
The best place for buying any software or technology is a store called Best Buy. This store offers the best prices to be found and has a wide selection of CD burning software in stock.
Use cd-burning software compatible with the .kar extension, to burn an audio cd. If this software is not availible, use a file-conversion program to convert it to another format (.wma, .mp3, .ogg or .m4a are more conventional formats), and then use a cd-burning program to burn an audio cd. Note that a cd-burner and software are required.
Burning of a CD means that you laser write data onto the silver surface of the CD.
There is no difference- writing files to a CD involves using a LASER to leave marks on the CD that can be re-interpreted later on by another CD player. Because of the fact a laser is used, the term 'burning' has come into common use.
To combine two CD's together, you can create a new compilation CD by transferring the songs from both CDs onto a computer, arranging the tracks in the desired order, and then burning them onto a blank CD. You can use CD burning software to help with this process.
Unless you have a rewritable CD, then no, you can't.
These days almost every laptop, (including MacBooks), come with on-board software designed to burn CDs/DVDs, so if you are unsatisfied with what is included, then there are (of course) people willing to provide you with alternatives. Some of the best are reviewed and compared here: http://cd-burning-software-review.toptenreviews.com/mac-cd-burning-software/
An ISO file is an image of a CD. You can use CD burning tools (Nero is one of them, and there are some freeware ones out there) to write that image to a blank CD.
The best option is to purchase this software at your nearest media store. There you will get a certain service on how the software works and which one is the best. Look for the official websites of the CD and DVD burning software and compare the prices.