a. Introduction/ definition of Boolean Operators, “And” “Or” “Not.b. If A, B two key words are connected with “OR” operator and made the string, then the search result would be all those records which have key word “A” or key word “B”, any of one of them and also those records which have both the key words “A” and “B”. Example . . .c. If A, B two key words are connected with “AND” operator and made the string, the search result would be all those records which have key word “A” and key word “B” both, other records will be not shown in the search result.Example . . .d. If A, B two key words are connected with “NOT” operator and made the string , the search result would be all those records which have key word “A” but not key word “B”. If the records having key word “A” and “B” both even though since it has key word “B” so it will not be shown in the search result.Example . . .