যোগাযোগ হল আদান প্রদানের উপায়। মানুষ থেকে মানুষ বা যন্ত্র থেকে যন্ত্রে তথ্য আদান প্রদান হতে পারে। মাধ্যম-ও তথ্য হতে পারে তড়িৎচৌম্বক বিকিরণ বা রেডিও-ওয়েভ।

Communication is commonly defined as the transmission of information. Its precise definition is disputed and there are disagreements about whether unintentional or failed transmissions are included and whether communication not only transmits meaning but also creates it. Models of communication are simplified overviews of its main components and their interactions. Many models include the idea that a source uses a coding system to express information in the form of a message. The message is sent through a channel to a receiver who has to decode it to understand it. The main field of inquiry investigating communication is called communication studies.