please tell me difference between gerund and  participle in detail.

The present participle in English has the same form as the gerund, but the gerund acts as a noun rather than a verb or a modifier. The present participle of most verbs has the form base+ing. 

Present participle is the verb form. For instance,

• I love sleeping.
• He is singing.

However, a gerund uses the verb form as a noun. For instance,

• Swimming is a good exercise.
• Laughing helps you stay healthy.

Hope this clears your doubt. Cheers!