why empty line is not getting stored in variable

Question

I am using below code

    #! /bin/bash
for host in $(cat ./server.txt)
do 
    echo \"$host\"

done

server.txt contains :

Answer 1

while read host; do echo "$host"; done < server.txt

With the code you provided, the file as a single string is given as the 4th argument to the for command. The shell then splits the string using arbitrary whitespace as a delimiter (assuming you have not altered the IFS variable).