The most popular way to apply for jobs
Job ads form part of the open labour market, and a detailed description of the candidate's profile and salary expectations are usually provided. Most job seekers prefer responding to job ads because they give the impression that a "real" job is available immediately. Without doubt, it's the most popular way to apply for jobs and so it's understandable that they form a key part of any job search strategy. However, do remember that they are just one way to search for a job.