Masks have never been in use even before the pandemic of COVID-19 in Nepal. But this is mandatory at present. Masks had been mainly used by the cleanliness and medical personnel. However, at present, everyone has to put the mask on to protect oneself from viruses. 
Mask only doesn't defeat the virus completely but it can protect oneself to some high extend depending upon its manufacturing and quality. On a serious note, physical, Social distancing is also very necessary.
Can masks protect against - the new Coronavirus infection?
Which mask is the safest?
N95 Mask
This mask is believed to suppress the virus to 95% and bacteria to 100% as per the specialists. Putting the mask on along with the face shield keeps the virus away.
Surgical Mask 
The surgical mask is be said to defeat the virus to 95% and bacteria, dust, and pollen to 80%. The specialists state surgical masks to not be as effective as N95 masks.
Fashionable mask(Sponge mask) 
This mask is largely manufactured for attraction purposes. This mask prevents transmission to 0.5% only.
Cloth mask 
A cloth mask also doesn't prevent the virus. Its capacity measures to zero. But this can protect oneself from bacteria, dust, and pollen to 80%.