Difference between can and may?

We use "can" to indicate capability or possibility, e.g. "I don't know if I can lift this piano by myself." The implication here is on whether you have the physical capacity or mental acuity to get the piano lifted. "May" is used when you are asking permission, "May I lift your piano for a little exercise?" Here you wish the permission of someone to carry out an action.

Examples:

This question has been discussed many times on the forum. The answer id depending on the speaker's perspective.

Do a Google querry: usage, can, could, grammar. You can learn much more on the usage than we can explain them.

In a nutshell, "May" is a more polite form of "can". Can - has that imposing tone. Grammatically, both are correct.

ahmedchcan anyone help me in definning difference between "may and "can"??

For an introduction to modal verbs you may want to take a look at this post. There you will get an overview of six major classes of modality organized conceptually, and you can see how various modal verbs fit into these six conceptual categories. You will see that, according to that c