I am a real estate agent. My only need for the camera that I purchase, is to have the best wide angle photos. I was looking at DSLR and point and shoot cameras. What is the best point and shoot camera (i'm not sure if this is the correct term, I'm speaking of something like the canon coolpix)? Also, are there some cheaper options for DSLR cameras with the attachments? I saw a canon ef-s 10-18mm that was priced pretty well but I don't know what kind of camera I would need to attach this to. Any help would be appreciated. Thank you!!
As the comments say, you first need to define "wide angle". My guess is that you want a camera that has a viewing angle of more than 90 degrees, but you don't want distortion to keep the walls straight. Then, the keyword you're looking for is "ultra-wide", as opposed to "fisheye" which also covers a wide angle but with strong distortion.
Indeed, a 10-whatever mm lens on an APS-C sensor body will do the trick (see https://en.wikipedia.org/wiki/Angle_of_view#Sensor_size_effects_.28.22crop_factor.22.29 for example). You probably want whatever to be large enough so that the same camera can be used to take more "normal" pictures.
You probably want reasonable low-light performance too, to get good indoors pictures without a flash, in which case an APS-C DSLR will be better than a typical point-and-shoot camera (the key element is the sensor size).
Most point-and-shoot camera won't go up to real "ultra-wide", but some of them can have a wide-angle adapter which may do the trick too.
You may want to look at hybrid cameras, which get most of the advantages of a DSLR without the mirror. Micro Four Thirds cameras may be a good fit for you.
For examples and arguments, see https://www.slrlounge.com/best-dslr-setup-real-estate-photography/
IANARSE, but I've worked with enough of them and reviewed enough photos of houses, both inside and outside, to know you really do not want a wide-angle lens. External shots should be done w/ normal to long lenses to produce aesthetically pleasing images.
Interior shots will be fine with a 50-mm -class lens, and if you want to show a "wide-angle" shot I would recommend using a camera which supports "panorama" imaging. The problem with lenses in the "wide-angle" category is the "fisheye" distortion which creeps in. Not something you want in your sales brochures.