Help!whats a year round job?Will i be kicked out after an year?

i recently applied for a job and i found a job as a flagger for a construction company,its a part time position.im done with my drug test and background and all set fot my training howeever i just realized today,that this job is a year round job,what does this mean?will i be kicked out after an year?im looking for a permanent position i dont want to have a job which im gona lose after a year,please help!