In logic, a logical connective (also called a logical operator, sentential connective, or sentential operator) is a symbol or word used to connect two or more sentences (of either a formal or a natural language) in a grammatically valid way, such that the value of the compound sentence produced depends only on that of the original sentences and on the meaning of the connective. 

The most common logical connectives are binary connectives (also called dyadic connectives) which join two sentences which can be thought of as the function's operands. Also commonly, negation is considered to be a unary connective. 

Logical connectives along with quantifiers are the two main types of logical constants used in formal systems such as propositional logic and predicate logic. Semantics of a logical connective is often, but not always, presented as a truth function. 

A logical connective is similar to but not equivalent to a conditional operator. 

In the grammar of natural languages two sentences may be joined by a grammatical conjunction to form a "grammatically" compound sentence. Some but not all such grammatical conjunctions are truth functions. For example, consider the following sentences: 

The words "and" and "so" are "grammatical" conjunctions joining the sentences (A) and (B) to form the compound sentences (C) and (D). The "and" in (C) is a "logical" connective, since the truth of (C) is completely determined by (A) and (B): it would make no sense to affirm (A) and (B) but deny (C). However, "so" in (D) is not a logical connective, since it would be quite reasonable to affirm (A) and (B) but deny (D): perhaps, after all, Jill went up the hill to fetch a pail of water, not because Jack had gone up the hill at all. QUESTIONS:

Q1:
1. What does a logical connective refer to?
2. What is the definition of a logical connective?
3. 
Q2:
1. What is another name for a logical connective?
2. How else are logical connectives referred to?
3. 
Q3:
1. Which connectives appear most frequently?
2. What are the most used connectives?
3. 
Q4:
1. Are logic connectives identical to conditional operators?
2. Is there zero difference between a logic connective and a conditional operator?
3. 
Q5:
1. What does negation mean?
2. How can negation be defined?
3. 
Q6:
1. How can one join two sentences using natural language?
2. What is the mechanism for combining two sentences using natural language?
3. 
Q7:
1. Are grammatical conjunctions considered to be truth functions?
2. Do grammatical conjunctions count as truth functions?
3. 
Q8:
1. Give an example of a grammatical conjunction.
2. What are some grammatical conjunctions that exist?
3. 
Q9:
1. Who climbed a hill?
2. Name someone that went up an incline.
3. 
Q10:
1. What was Jill after?
2. What was Jill fetching up the hill?
3. 
Q11:
1. Did Jack climb the hill?
2. Did Jack mount the incline?
3. 
