Usado para SEO, Sitemaps servem para informar aos sites de busca como indexar as páginas de um site. Indexadores descobrem páginas com base em links no site e outros sites e o que os Sitemaps fazem é complementar esses dados, para permitir que os indexadores com suporte para Sitemaps peguem todos os URLs no Sitemap e aprendam sobre esses URLs usando os metadados associados.
Existem sites para gerar o arquivo, mas fazer isso no Rails não é complicado e faremos isso em 4 passos. A dica vem do Tony no livro Advanced Rails Recipes.
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