conclude the purpose of expressing greetings
Answers
Greeting someone you know is a vital part of courtesy and goodwill. All societies have some form of greeting. They are basic to civilized interaction.
The first point about greetings is to do them. It's important to say "hello" even when you feel a bit cranky or shy. It's also important to make introductions even when you're not certain of precisely how it should be done in that situation. Every greeting and introduction is an opportunity to demonstrate respect for others and to create a favorable impression of yourself to others.
Greetings
When you greet someone, you acknowledge their presence. Most people do this automatically and barely notice they're doing it. But failing to offer a greeting to someone you know can easily cause hurt feelings and misunderstandings – you are failing to acknowledge their existence in your presence. Little can be considered more offensive than patently ignoring someone, as this strikes to the heart of the most basic of human needs, inclusion and social interaction.
If someone who usually greets others in a friendly way does not one day, those other people may feel snubbed or think that person is behaving oddly. This can happen for a variety of reasons, such as being preoccupied or distracted, being late for an appointment and rushing, or even forgetting their glasses and not being able to recognize someone they know. Usually these omissions can be corrected with a warm greeting the following occasion, but these omissions illustrate the first essential of manners of good greeting, which is noticing other people.
hope this helps you and have a good day.