bash – Writing a For Loop That Iterates Over String Values in Bash Shell Script

In bash, I know that it is possible to write a for loop in which some loop control variable i iterates over specified integers. For example, I can write a bash shell script that prints the integers between 1 and 10:

#!/bin/bash

for i in {1..10}
do
 echo $i
done

Is it possible to instead iterate over a loop control variable that is a string, if I provide a list of strings? For example, suppose that I have a string fname that represents a file name. I want to call a set of commands for each file name. For example, I might want to print the contents of fname using a command like this:

#!/bin/bash

for fname in {"a.txt", "b.txt", "c.txt"}
do
 echo $fname
done

In other words, on the first iteration, fname should have the value fname="a.txt", while on the second iteration, fname should have the value fname="b.txt", and so on. Unfortunately, it seems that the above syntax is not quite correct. I would like to obtain the output:

a.txt

b.txt

c.txt

but when I try the above code, I obtain this output:

{a.txt,

b.txt,

c.txt}

Can you please help me determine the correct syntax, so that I can iteratively change the value/contents of the variable fname? Thank you for your time.