Answer:
Because Dubai is growing incredible fast there is a huge need for expats from abroad. Therefore the online recruitment is one of the means to reach the necessary skilled people.
The companies and agencies will use the submitted CV's to make a first selection. Many times the second round consists of an interview by telephone and the right candidate is even selected before a meeting in person.
Make a good CV and apply many times online on the vacancies that match your experience & skill set is a good way to find a job in Dubai.
Visit the pages of jobsites, recruitment agencies and company career pages on a regular basis. Find the longest list of direct links on the Startpagedubai Job Page: www.startpagedubai.com/jobs.htm
Be aware: Do NOT pay for submitting your CV. The UAE law forbids recruitment agencies to ask money from jobseekers.
Be sure you know the laws and regulations regarding employment in Dubai; see the link below.