An interferometer consists of two separate telescopes that combine their signals almost as if they were coming from separate portions of a telescope as big as the two telescopes are apart. An array is the name used when the interferometer has more than two elements, that is, when more than 2 telescopes are used together to form the image.
The resolution of an array approaches that of a telescope of diameter equal to the largest separation between its individual elements (telescopes). However, not as many photons are collected by the array as would be by a giant single telescope of that size.
Some famous arrays are
the Very Large Array VLA
the Very Long Baseline Array VLBA
the Atacama Large Millimeter Array ALMA
the Westerbork Synthesis Radio Telescope WSRT
the Australia Telescope Compact Array ATCA
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