Simple queries allow end users to enter simple, comma-delimited strings and use wildcard characters. By default, a simple query searches for words, not strings. You can use wildcards, however to broaden the scope of the search.
Case is ignored.
Ordinarily, operators are employed in explicit query expressions. A simple query employs the STEM operator and the MANY modifier. The MANY modifier forces the documents returned in the search to be presented in a list based on a relevancy score. Explicit queries can be constructed using a variety of operators, including evidence, proximity, relational, concept, and score operators. You can use the AND, OR, and NOT operators without angle brackets.