Smart phones have sophisticated cameras that can actually yield professional quality photos that you may want to print and save. However, if you email these pictures or use them on social media, the quality will be diminished. Resolution and compression will be compromised in sending them this way.
There are also some apps which will degrade your photos. Snapseed is one of the good guys in this department as it doesn't change the quality of your images.
Cropping pictures can also reduce the number of pixels in a picture.
If you want to give a picture to a friend, the best way to do that is Air Drop. You simply tap on the picture while in close proximity to your friend's device and the picture will hop right over without quality being affected. Drop Box and iCloud Library are safe ways to store images without their being "re-sized for you" as they are when you send them through Facebook and Instagram and other social media sites.
Camera Plus is an app that you can use to check out the number of pixels and the resolution of photos you want to enlarge and print.
iPhotoPhotography site and classes cover this in much more detail in the class called iPhone Photo Editing.
http://cdn.iphonephotographyschool.com/wp-content/uploads/7-Photo-Apps-June-2015.pdf
https://iphonephotographyschool.com/iphone-photo-printing-apps/
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