Work is the act of producing or accomplishing something or the place where things are produced or accomplished. Work can be a noun (place, or thing) or a verb (an action) . Examples as a noun: I am at work. I am looking for work. Examples as a verb: I need to work. I am working hard on my homework. A job is a type of work (usually paid work). Job is normally used as a noun. Job can be a verb, but it is almost never used that way in everyday conversation and writing. Examples as a noun: Examples as a noun: I have a job. I need a job. My job is cleaning. Business is what you do to make money.It can also be used in place of responsibility or concern. Its is used as a noun. Example as "what you do to make money" : I will start a cleaning business. The business is making money. Examples as "responsibility/concern": Your safety is my business. The conversation is none of your business. When you put them together it can work like this: My job is working at a cleaning business.I need to find work because I lost my job at the cleaning business. My boss at my new job has no business asking about my health as long as I am able to work. I hope this helps!

The three have very similar meaning. The biggest differences can sometimes be idiomatic (based on how we say things rather than what we mean). The words also carry secondary meanings, which can make things complicated. I find it hard to specify the differences, but I'll give some examples. 'Job' and 'business' in their original meanings are to do with money. This means that we'd usually say a student doesn't have a job. Instead, a student might have a lot of work to do - in this case, their 'work' is 'studying'. 'Job' often tends to refer to a more abstract notion. For example, your 'job' might be 'manager'. On the other hand, your 'work' is usually more specific. For example, your work involves writing emails and hiring people. 'Business' is usually not used on a personal level to mean something work-related. Unless you literally own the business (e.g. you're the boss), you wouldn't say 'my business is ...' . However, we often use business to mean private matters ("That's none of your business"). We have to phrase things differently even if we mean similar things. Common statements are "I have work to do", "I have a job to do", "I have business to attend to" - the three nouns, even though they mean the same thing, take different forms. I don't think it's possible to completely describe this, but perhaps this might have helped.