Answer:
Genome indexing is a strategy to find a pattern (i.e., a short sequence read) in a long text (i.e., the genome)
Explanation:
Genome indexing is a similar strategy used when a book is indexed. This strategy is used to find more rapidly a given sequence by allowing to align the problem sequence and thus approximate to the putative origin of the query sequence within the genome. Genome indexing enables to design PCR primers/probes, map probes at genome level, understand data obtained from gene expression analyses, etc.
