A real, paid job where you also train towards a recognised qualification. In England at least 20% of your normal working hours are spent training, and you don't pay tuition fees.
An experienced colleague who supports you during your apprenticeship, separate from your manager. Many employers also give you a 'buddy', often a current apprentice.
The science of measuring things precisely. In manufacturing, metrology technicians check parts are made exactly to spec, as on Williams' metrology pathway.
Definitions are our own plain-English summaries. Where we give figures, they come from the official sources listed on
the linked guide or profile. Rules can change, so check the official source before you make decisions.