Final answer:
In Boolean algebra, a literal refers to a single variable or its negation. It is used to build logical expressions and perform operations such as conjunction, disjunction, and negation.
Step-by-step explanation:
In Boolean algebra, the term 'literal' refers to a single variable or its negation. It is a basic element in Boolean expressions that can only have two possible values: true or false.
For example, in the expression 'A + B + C', each letter represents a literal. If we assign the value 'true' to A and B, and 'false' to C, then the expression would evaluate to true.
Literals are used to build logical expressions and perform operations such as conjunction, disjunction, and negation in Boolean algebra.