Abstract
A review is given of infrared radiation from interstellar clouds, with emphasis on the new results generated by the IRAS survey. Infrared sources found in the dense cores of cold molecular clouds may be either protostars or embedded T Tauri stars. The dust associated with the diffuse neutral phase of the interstellar medium has been detected by IRAS as the infrared "cirrus". The intensity of the far infrared emission has been correlated with the hydrogen column-density and with the extinction derived from star counts. Very small grains, essentially large molecules, may be responsible both for the unidentified infrared emission features and for the diffuse near and middle infrared emission unexpectedly found in reflection nebulae and in the cirrus.
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