RNA splicing and alternative splicing are two types of modifications that follow the transcription of eukaryotic genes. Both are important for the production of a functional protein. They share the following similarities:

• Both splice exons by removing introns
• They are both post-transcriptional modifications that occur during eukaryotic gene expression
• Both occur inside the nucleus 
• Both produce a mRNA molecule
• The effector molecule for both is the primary RNA strand