The internet

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Across
  1. 2. - a place, person, or thing from which something originates or can be obtained
  2. 4. - a global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardized communication protocols
Down
  1. 1. - relating to the present or recent times as opposed to the remote past
  2. 3. - the earth, together with all of its countries and peoples
  3. 4. - facts provided or learned about something or someone
  4. 5. main thing is the most important one of several similar things in a particular situation.