Answer:
Search engines.
Step-by-step explanation:
A Search engine is an internet resource or service that searches for keywords or categories specified by the end user and then displays (shows) a list of website which matches or have informations similar to the query. Some examples of popular search engines are Goo-gle, Bing, Yahoo, etc.
Search engines avails a job seeker the ability or opportunity to search several (different) Internet career sources at the same time. This is so because search engines are a global resource that comprises of several website in their database, which all end users with an active internet connection can easily access remotely.