My opinion.

The process by which tasks normally performed by humans are replaced with machines of some kind. These machines could be mechanical or electronic.
Do not call it an ATM machine – that's redundant. Robot arms in car factories and Etc.

Modern people are unhappy because they cannot experience completion. No one knows if they have reached their destination or if that end-point is years ahead.

The real problem of man is how to became a man as a rational being. If man knows how to go with the flow of life, not doing anything against the law of humanity then there would be no problem. Most problem arise from lack of discipline and self abuse.