Think about the conversations you have with your friends. The last conversation you had with a boyfriend/girlfriend/spouse. A phone call to your family. Are all of the conversation styles exactly the same? The answer should be "no". How you speak to your friends is a little different than the way you speak with family.
How about when you go to a restaurant? When the waitress takes your order, she doesn't talk to you the same way a loved one does. It would be very strange if she said, "Do you want to try my coffee, my sweet darling". Waitresses use language that is only useful in restaurants but would be too formal in casual situations with friends.
The same is true in business situations. The rules for communicating in meetings, phone calls, customer service, sales and more are different than the rules for talking in your home. But what is different?
The biggest differences in business communication and in social conversations are: vocabulary, idioms, grammar and context.
Vocabulary
When you go grocery shopping, you might look for some fruit. For example, you might want an apple or a banana.But in business, we talk about "product". And an apple is a "specific product" or "an item".
Idioms
In an argument, you might shout at someone to "fix their problem". But in business, it is inappropriate to seem angry, to shout and to use too direct language...especially if the person is a colleague! Instead, we tell them to "strongly look for ways around the issue". ("a way around+the s/th") Another idiom is: "to be in the black". In other words, to have a profitable account for your records.
Grammar
In social situations, we mix up grammar but generally stay within textbook rules. But in business English, we often mix and match grammar. We might even change verbs into nouns, nouns into verbs! In fact, we might even drop the subject of a sentence, or even the object! For example," Google the wordage, if you don't catch the meaning."
Context
Finally, context is a big difference in these two styles of speaking: in conversation English, most people use an indirect style, taking their time to tell their story. In business situations, "time is money", so businesspeople prefer to "get the story straight". In other words, don't waste people's time; get to the point of your topic.And knowing when to tell a joke and when not to is critical during business interactions.