BLAST

Use the BLAST tool to find sequences that are similar to a given protein or DNA sequence. BLAST stands for ‘Basic Local Alignment Search Tool’. The reference for BLAST is Altschul SF, Gish W, Miller W, Myers EW, Lipman DJ., ‘Basic local alignment search tool.’, J Mol Biol. 1990 Oct 5;215(3):403-10.

You can use BLAST in two ways: Either go to the public BLAST website maintained by NCBI. Or download the BLAST tool, install it locally on your computer and perform BLAST searches offline.