Difference between British and American

Different kinds of English have different pronunciation. For example, the pronunciation (the accent) of British English is different from the pronunciation of American English.

The most frequently learned kinds of English in the world are American English and British English.
Learn more about British accent here: British accent

/t/ sound

The sound /t/	British accent	American accent
Item	/ˈaɪtəm /	/ˈaɪdəm /
Bottle	/ˈbɒtl/	/ˈbɒdl/
Letter	/ˈletə/	/ˈledə/
computer	/kəmˈpjuːtə/	/kəmˈpjuːdə/

/r/ Sound
In american Accent, words including /r/ sound are pronounced very clearly while in British accent, there is hardly no sound /r/ which has clear pronunciation
Eg:Or, Father, Mother, Learn, Letter, Car

/æ/ Sound
In British Accent, words including /æ/ sound are pronounced /a:/. . In American Accent, it is pronounced with wide opening mouth

The sound /æ/	British accent	American accent
Fast Staff Cat Lamp	/fɑːst/ /stɑːf/ /ka:t/ /lɑːmp/	/fæst/ /stæf/ /kæt/ /læmp/

/ɒ/ Sound
In American accent, words including /ɒ/ have a tendency to be pronounced /ɑ/

The sound / ɒ/	British accent	American accent
Document Occupied Copy Monitor	/ˈdɒkjumənt/ /ˈɒkjupaɪd/ /ˈkɒpi/ /ˈmɒnɪtə/	/ˈdɑːkjumənt / /ˈɑːkjupaɪd/ /’ka:pi/ /ˈmɑːnɪtər/

Besides, there are some differences between American Accent and British Accent in their written forms

	British accent	American accent
Either Neither Via Privacy Direction Clerk Garage Schedule New Laboratory Adult Brochure Route Advertisement Controversy Patent Apricot Vase Huricane Equiry Leisure	/‘aɪðər/ /‘naɪðər/ /’vaɪə/ /ˈprɪvəsi/ /daɪˈrekʃn/ [klɑːk ̩] /’gæridʒ ̩/ /ˈʃedjuːl/ /njuː/ /ləˈbɒrətri / /ˈædʌlt/ /ˈbrəʊʃə/ /ruːt/ /ədˈvɜːtɪsmənt/ /kənˈtrɒvəsi/ /ˈpeɪtnt/ /ˈeɪprɪkɒt/ /vɑːz/ /ˈhʌrɪkən/ /ɪnˈkwaɪəri / /ˈleʒə/	/ˈiːðər/ /niːðɚ/ /’viːə/ /ˈpraɪvəsi/ [dɪ:'rekʃn] [klɝːk] /gəˈrɑːʒ/ /skedju:l/ /nuː/ /ˈlæbrətɔːri/ /əˈdʌlt/ /broʊˈʃʊr/ /raʊt/ /ˌædvərˈtaɪzmənt/ /ˈkɑːntrəvɜːrsi/ /ˈpætnt/ /ˈæprɪkɑːt/ /veiz/ /ˈhɜːrəkeɪn/ /’ɪnkwəri/ /ˈliːʒər/