I actually share your inquisitiveness.
From what I got to see, "essential" was, is and will be stuff like electricity and water works, gas stations, food supply and, of course, doctors and medical staff.
Less essential were for instance builders that stuck to the protective measures. Those may be allowed to return to their tasks under same provisions.
Fat load of good this does for anyone whose car breaks down, garages being closed as from the beginning of the lockdown. Good thing I bought a brand new one not so long ago and the potential of being part of any pile-up is low on account of there not being much around to pile on to. Trees remain an opportunity though.:mrgreen:
I came across this website (link attached below), which gives a list of essential businesses. It's dated the 3rd, so only a few days ago. I'm surprised the list is that long, also, car repairs are listed, so that's good news for anyone car reliant for work.
"The announcement by the government about the tightening of these lockdown measures has inevitably led to questions from the public as to what activity is said to be “essential” and what remains open. The services which are classed as essential are:"
anything medically or healthcare related, as well as pharmaceutical activities (including the production and selling of pharmaceuticals)
orthopaedic and optical services
transport of food and some goods (including home delivery services)
public transport (operating a reduced service)
services related to water, electricity and gas supplies
establishments selling food other products considered to be of primary necessity (supermarkets and similar)
newsagents, tobacconists, launderettes and dry cleaners’
vets and establishments selling food and essentials for animals
petrol stations and fuel distributors
telecommunications operators
insurance companies and banks
car repair services
shops selling or repairing technological and telecommunications equipment
ports and airports
the press, radio and television
security forces and law enforcement bodies
Coronavirus: as the Spanish government tightens lockdown to include all non-essential workers, what is still open in Spain? — idealista