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ctrl + s versus ctrl + z in a terminal

ctrl + s

ctrl + s freezes the terminal display. This is useful to read an information when a loot of text is outputted in the terminal. To unfreeze the terminal you have to press ctrl + q.

ctrl + z

ctrl + z freezes the current process and put it in the background. You can unfreeze it in the background with the command bg or unfreeze it in the foreground with the command fg. You can also start a process directly in the background by adding the character & at the end of the command launching it. The command jobs displays the different processes in the background. You can also use the bg and fg command followed by the process number outputted by jobs to interact with a specific process.