RNA splicing is a process that occurs in cells after DNA is transcribed into messenger RNA (mRNA). During splicing, non-coding regions called introns are removed from the mRNA, while the coding regions known as exons are joined together. This modification is essential for producing a functional mRNA molecule that can be translated into a protein. The splicing process is carried out by a complex called the spliceosome, which recognizes specific sequences at the boundaries of introns and exons. Proper RNA splicing is crucial for gene expression, as errors can lead to the production of nonfunctional proteins or contribute to diseases.