"Focus" and "concentrate" are interchangeable in some sentences. But both words have multiple definitions, so when used with their other meanings, then they are not interchangeable. When the meaning you want is "to cause (attention, efforts, strength, etc.) to be used or directed for a single purpose" then focus and concentrate can be used interchangeably. For example, "She can concentrate (focus) better when she studies in a quiet place." "The city is focusing (concentrating) its efforts on building temporary shelters so that no homeless people will be sleeping on the street." In my opinion, I think focus can sometimes be a better verb in situations when attention is being given to something but without a goal or effort to try to do something . For example, "During the election, many people focused on the candidate's past romantic relationships rather than whether he had the experience to do the job." I don't think "concentrate" would work as well in that sentence. Focus and concentrate are not interchangeable for their other meanings, including when they are used as verbs in these ways: Focus can mean " to adjust (something, such as a lens or a camera) to make an image clear" or "to cause (light) to come together at a point" Concentrate can mean "to make (something, such as a liquid) stronger by removing water.

Buongiorno Martina, In the figurative sense, "to focus on" and "to concentrate on" both have the same meaning. In these examples: "Please leave me alone; I need to focus on this project." - "Please leave me alone; I need to concentrate on this project." "Lasciami stare per favore. Devo concentrarmi su questo progetto." It is only in this context that both of them have the same meaning. In other contexts, they do not have the same meaning. Because English is a very contextual language, the meanings of most words and verbs will change depending on the context that they are used in. I think that this dictionary will help you to better understand the difference between "to focus" and "to concentrate": http://www.wordreference.com/enit/focus http://www.wordreference.com/enit/concentrate I studied Italian at school but I have forgotten 98% of it but don't hesitate to get in touch with me if you need more help with improving your English. :-) A presto Alex

You need to provide an example for context. If you mean "to focus on" and "to concentrate on", then they are synonyms. If you mean "to focus [something]" and "to concentrate [something]" then they have different meanings. The nouns "focus" and "concentrate" also have completely different meanings.

both are same its just a synonyms of each other