Explain in DETAIL how time to live works

Each packet can only pass through a finite number of hops. A packet’s time to live (or TTL) is a number that indicates how many hops the packet can partake in and is reduced by one with each hop. When a packet’s TTL expires, the packet is said to be dropped, meaning that the packet is deleted. The recipient will notice a missing packet and request that the sender transmits the missing packet again.