"Advertised vacancies" refers to job positions that companies publicly promote and share with the intention of finding suitable candidates to fill those openings. Full definition
A number of recruitment agencies specialising in architecture, environment and construction advertise vacancies for landscape architects. (prospects.ac.uk)
Most large employers advertise vacancies on their own websites. (prospects.ac.uk)
Academic institutions and charitable organisations may also advertise vacancies through their websites. (prospects.ac.uk)