text: Small nuclear RNA (snRNA) and small nucleolar RNA (snoRNA) are widely known to guide the nucleotide modifications and processing of rRNA.  Both snRNA and snoRNA are categorized into a class of small RNA molecules that are present in the nucleus. However, they vary a lot by function. snRNA are 80-350nucletides long while snoRNA are 80-1000 nucleotides long in yeast. snRNA plays a critical role in regulating the pre-mRNA silencing. On the other hand, snoRNAs are involved in mRNA editing, modification of the rRNA and tRNA, and genome imprinting. Major function of snoRNA includes the maturation of rRNA during ribosomal formation. Small nuclear and small nucleolar RNAs are critical components of snRNPs and snoRNPs and play an essential role in the maturation of, respectively, mRNAs and rRNAs within the nucleus of eukaryotic cells. Both snRNA and snoRNA are involved in modifying RNA just after transcription. snRNA can be found in splicing speckles and Cajal bodies of the nucleus of the cell.snRNA and snoRNA requires a phosphorylated adaptor for nuclear export (PHAX) to get transported to the site of action within the nucleus.