I'm sure that in your country there are dialects. Try to think about people in villages or parts of your coutnry, that they use different words, different expressions compared to the official language - the language everyone is supposed to understand. Dialect means different expressions, differenet verbs and most of the times different accent.
Accent is the way one pronounces the language. Here are two examples. Scottish people have a different dialect compared to Queen's English. They use their own expressions, verbs and they have a different pronounciation.
An example of accent now. In my country we have in the North and South different accents. In the North they pronounce the l very strongly whereas in the South, mildly.
I'm sure you can think of a dialect in your country.
Hope I have been helpful