Toil is an inevitable aspect of managing production services, characterized by manual, repetitive tasks that lack enduring value and grow linearly with the service. A key objective for SREs is to reduce toil, aligning with Google's definition: 'Toil is the kind of work tied to running a production service that tends to be manual, repetitive, automatable, tactical, devoid of enduring value, and that scales linearly as a service grows.' For more details, refer to Google's SRE book.