What is the exact meaning of IFS=$'\n'?

What is the exact meaning of IFS=$'\n'?

bash shell variables environment-variables ifs

bash

What does IFS= do in this bash loop: `cat file | while IFS= read -r line; do ... done`

bash ifs

bash

Trying to split a string into two variables

bash shell ifs

bash

IFS=: leads to different behavior while looping over colon-separated values

bash shell for-loop ifs

bash

Surprising array expansion behaviour

arrays bash shell ifs

bash

Split text file into array based on an empty line or any non used character

arrays bash ascii echo ifs

bash

How does one properly assign temporary Bash variables on a per-command basis?

bash scope ifs

bash