More than often we use different writing styles while writing official emails and letters to friends. These two basic different styles are termed as formal and informal styles of writing, respectively. Example 1: This is to inform you that your application for the job has been approved and you are hereby requested to be present tomorrow at 11.30 a.m. for a personal round of interview at our office. Example 2: Hey, guess what I have been called for a personal round of interview tomorrow. I am so happy. Wish me luck to perform well tomorrow. The difference between the above two written communications is obvious – the first one being formal one and the second, the informal one. So, what are basic differences between formal and informal writing? Well, it the style and the tonality of the language used by the writer. And ideally, the writer should first analyze the situation, the context, and the recipient and accordingly determine the tone, vocabulary, and the style to be used before finally concluding to write.