There is not one official language spoken by the world.
Where is English spoken as second? English is an official language in the world.
The official language spoken in England is English.
The official language spoken in Panama is Spanish.
The official language spoken in the Netherlands is Dutch.
The official language spoken in Montserrat is English.
Mandarin Chinese is the most spoken language in the world besides English. It is the official language of China and is also spoken in other countries such as Taiwan and Singapore.
The official language spoken in Bratislava, Slovakia is Slovak.
The official language spoken in Romania is Romanian.
The official language spoken in Georgia is Georgian.
The official language spoken in Norway is Norwegian.
The official language is the language that is mostly used in official departments. In many countries it is also the spoken language. However, in many countries it could be different than the spoken language(s) there. That happens sometime in small countries that use a more common language than their native language for official use. However, it may also occur in countries where the official language is not the common spoken language, such as in the Arab World where the spoken languages are remarkably different from Arabic, the official language there.
English is spoken in the largest number of countries.