What displays images and text produced by the computer?

Ok, your Wording makes it sound as if the computer is producing text and pictures. In fact; any text or pictures that you see are generated by embedded programs or software; otherwise a user may download or upload a picture or type out a text to produce image and text files.

Simple:

However; in the case that the question was simply what displays images and text. The simple answer is that it is the computer monitor that actually displays all the pictures or text we see.

Linux

Details:

The monitor receives signals; through a signal cable; from a video processor either built into or added onto the computer's mainboard. That video processor receives the information through a port or a bridge. The port or bridge receives data from a user's software and hardware controlling software (called drivers) processed by the CPU (central processing unit).

Speculation:

In the case that the question was "what programs display pictures and text?"...

..On a computer most files are all named by type. The ending letters in a file; known as a file extension or file type; after the last dot (.) determine the type of file and from that you can find what program opens it on the internet with a simple search. The most popular types of pictures are generally gif, jpg and png. Files such as "mygraduation.gif" or "mypicture.jpg" or even "vacation2000.png" etc... are likely pictures. Sadly; not all picture programs open all pictures. You may need to install, purchase or download the program that reads files that end in .jpg or .gif etc... In the case of text files (i.e. files ending with .txt) ; most text programs in the Linux, MAC and Windows operating systems read text files universally.