Who is president of united kingdom ?

They don't have a president. they have a Queen named Queen Elizabeth the third

Explanation:

If you meant United States then it is Donald Trump

Actually they are not having a president but they are having a queen which called Queen Elizabeth the third..president is for the United States and know he is Donald trump and he is changing every 4 years.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.