-# The Vector Space Model (VSM) is used to compare natural language texts.
-# Texts are translated to multidimensionnal vectors then compared by cosine
-# similarity.
+# Vector Space Model (VSM) is an algebraic model for representing text documents
+# (and any objects, in general) as vectors of identifiers, such as, for example,
+# index terms.
+#
+# It is used in information filtering, information retrieval, indexing and
+# relevancy rankings.