It depends. Here are examples: In this sentence, a comma is only necessary after the "for example": For example, yesterday she fell down and didn't even cry. In this sentence, a comma is necessary before and after "for example": You, for example, would also be depressed if you were failing trigonometry.
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It is usually not necessary.
Example: It was hot, humid, and raining. In the example above, the comma after "humid" is unnecessary but acceptable. The use of the comma before 'and' is called the 'serial comma' or the 'Oxford comma', it's optional. Many people use the serial comma for clarity. The other use of a comma is to break up a long sentence, and signifies a slight pause. Example: He hit the ball, dropped the bat, and ran to first base.
Before EX: I need eggs, and butter.
When its not used in a list for example you will need to stay safe here ,and remember to stay with us
I assume that you are asking whether one should use a comma before 'and' when writing a series of items. For example: When you are going shopping, please buy milk, eggs, butter, and cheese. Unfortunately, there is no one concrete answer to this question. In fact, the question as to whether one should put a comma before the 'and' when completing a series is so hotly debated among grammar enthusiasts that it has received a name: the Oxford comma. Those who support the use of this comma before the 'and' argue that when a comma is not used, it makes the last two items seem as if they are part of one unit. For example: My favourite types of sandwich are egg salad, tomato, peanut butter and jam. Though technically it is not grammatically correct if one takes 'peanut butter and jam' to be a single type of preferred sandwich, it is a common misreading of the sentence. However, for those who do not support the use of this comma, the argument is that 'and' takes the place of the comma--that and literally has the same meaning as a comma in this context. An example would be this: I need to buy pencils, erasers, pencil crayons and looseleaf. There is no real 'right' answer to this question; it is merely a matter of consistency and personal preference. I like to use a comma before 'and', but if you don't, that is also fine. The important thing is that you remain consistent. If you are going to put a comma before 'and' in a list, then always do it.