What is the most useful and helpful word in english language?

i think thank you is the most useful and helpful word...:)

Actually, all the words in the english vocabulary are helpful. The word helpful alone is a very useful word. And all what I've used in here are helpful. Without such words, our sentence would be incomplete and without any sense. And therefore, we are thankful for such words. I refer to words such as sorry, thank you, please, excuse me as words of character!

The most important helpful words in English are:
1. Please
2. Hello
3. I or me
4. Yes or No
5. Ok

i think 'hellow' is the most useful and helpful word in our daily life. we can greet any new people with this word and it shows dearness and closeness with each other when they greet.hellow is used as greeting and expression of surprise.hellow is often often used when answering the telephone, or as an informal greeting. Students learning a new computer programming language will often begin by writing a "Hello, world!" program, which outputs that greeting to a display screen or printer. so i think hellow word is useful in many forms for us.