Stopwords / Stoplist

1. Function words do not bear useful information for IR of, in, about, with, I, although,.....

2. Stoplist: contain stopwords, not to be used as index
     a. Prepositions
     b. Articles
     c. Pronouns
     d. Some adverbs and adjectives
     e. Some frequent words (e.g. document)

3. The removal of stopwords usually improves IR effectiveness

4. A few "standard" stoplists are commonly used.