RNA extraction is a laboratory method used to isolate ribonucleic acid (RNA) from biological samples like cells or tissues. This process is essential for studying gene expression, making cDNA, and performing molecular tests such as PCR or sequencing. The basic steps include breaking the cells open (lysis), removing proteins and other unwanted components, and finally purifying the RNA. Care must be taken to prevent RNA degradation, as it is less stable than DNA. Once extracted, the RNA can be used to better understand how genes are working in different conditions or treatments.