Helvetica is a typeface that was designed in the year 1957 and was mainly meant to be used for European languages of Latin origin. However, the popularity of this font grew all over the world till it came to be used even in languages like Hindi, Chinese and Japanese.
The Helvetica font is widely used by the U.S. government especially in legal and official documents. It is also the most popular font for signage all over the world. The Helvetica Bold is a darker version of the original Helvetica and is usually used when something in a document or a text requires special emphasis.