First of all we must have knowledge about Epidemic and Pandemic.
EpidemicBigger and spreading.
An epidemic is an outbreak over a larger geographic area. When people in places outside of Wuhan began testing positive for infection with SARS-CoV-2 (which causes the disease known as COVID-19), epidemiologists knew the outbreak was spreading, a likely sign that containment efforts were insufficient or came too late. This was not unexpected, given that no treatment or vaccine is yet available. But widespread cases of COVID-19 across China meant that the Wuhan outbreak had grown to an epidemic.
PandemicInternational and out of control.
In the most classical sense, once an epidemic spreads to multiple countries or regions of the world, it is considered a pandemic. However, some epidemiologists classify a situation as a pandemic only once the disease is sustained in some of the newly affected regions through local transmission.
To illustrate, a sick traveler with COVID-19 who returns to the U.S. from China doesn’t make a pandemic, but once they infect a few family members or friends, there’s some debate. If new local outbreaks ensue, epidemiologists will agree that efforts to control global spread have failed and refer to the emerging situation as a pandemic.
The first case was from china in November 2019
https://www.scmp.com/news/china/society/article/3074991/coronavirus-chinas-first-confirmed-covid-19-case-traced-backThat's more than a month earlier than doctors noted cases in Wuhan, China, which is in Hubei province, at the end of December 2019.
On Dec. 31, 2019, researchers from the Wuhan Institute of Virology under the Chinese Academy of Sciences were assigned the urgent task of conducting whole-genome sequencing on samples sent by the Wuhan Jinyintan Hospital, which possibly contained unknown pathogens. With strenuous efforts, the institute managed to complete the mission in less than a week on Jan. 2, 2020, and they shared with the world the whole gene sequence of COVID-19, winning international recognition for their "Chinese speed.
http://www.china.org.cn/china/2020-04/20/content_75953343.htmUpdated WHO advice for international traffic in relation to the outbreak of the novel coronavirus 2019-nCoV
https://www.who.int/news-room/articles-detail/updated-who-advice-for-international-traffic-in-relation-to-the-outbreak-of-the-novel-coronavirus-2019-ncov-24-jan/In response to WHO’s denial that Taiwan ever alerted it to the possibility of human-to-human transmission of COVID-19, the Central Epidemic Command Center makes the following statement. 11 April, 2020
https://www.cdc.gov.tw/Category/ListContent/sOn2_m9QgxKqhZ7omgiz1A?uaid=PAD-lbwDHeN_bLa-viBOuwThe 2019 novel coronavirus (2019-nCoV), officially named as COVID-19 pandemic by the WHO, has spread to more than 180 countries including China. Confirmed novel coronavirus cases increased ten-fold in less than a month, from 100,000 in the first week of March to more than one million on 02 April, while more than 52,000 deaths have been reported across the world. Europe has become the new epicentre of coronavirus. More than 90% of the global COVID-19 cases are currently outside China.
https://www.pharmaceutical-technology.com/features/coronavirus-outbreak-the-countries-affected/ World Health Organization, "COVID-19 Virtual Press Conference," April 20, 2020,
https://www.who.int/docs/default-source/coronaviruse/transcripts/who-audio-emergencies-coronavirus-press-conference-20apr2020.pdfA strain of COVID-19 that has infected more than 300 people in Beijing since early June could have originated in South or Southeast Asia, according to a study by Harvard University researchers.
https://in.reuters.com/article/us-health-coronavirus-china-study/covid-19-strain-in-beijing-outbreak-may-have-come-from-southeast-asia-harvard-study-idINKBN2430R4And Today situation according to Worldometer
Coronavirus Cases:
72,373,955Deaths:
1,615,812Recovered:
50,712,760https://www.worldometers.info/coronavirus/Here is Country wise details.
https://www.worldometers.info/coronavirus/#countries 
