Standard error is a statistical method to assess the correctness of a population sample distribution by using standard deviation. If a sample mean deviates from the population mean, it is known as standard error.
The significant difference between standard error and standard deviation is that the former uses sample data whereas the latter uses population data, i.e. parameter. Lower the standard error, more closely is the sample cluster toward the population mean.
The standard error is same as the standard deviation for a given sample size upon the square root of the sample size.