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A microarray is a multiplex lab-on-a-chip. It is a 2D array on a solid substrate (usually a glass slide or silicon thin-film cell) that assays large amounts of biological material using high-throughput screening methods.

Types of microarrays include:

• DNA microarrays, such as cDNA microarrays, oligonucleotide microarrays and SNP microarrays
• MMChips, for surveillance of microRNA populations
• Protein microarrays
• Tissue microarrays
• Cellular microarrays (also called transfection microarrays
• Chemical compound microarrays
• Antibody microarrays
• Carbohydrate arrays (glycoarrays)