The review deals with the fabrication and characterization of interdigitated array (IDA) microelectrodes. The close constitution of IDA causes special effects which can be useful for analytical applications. Transport phenomena of the microband IDA microelectrodes are surveyed and the consequences of the diffusion layer overlapping, such as a high collection efficiency in comparison with RRDE and current amplification by redox cycling, are discussed. A brief description of the fabrication of vertically separated IDA microelectrodes is given.