Now for some soft text formats: emphasised text (often italic), strongly emphasised text (bold), and a reference citation (often italic)
Now some examples of block text formats:
a block of preformatted text using a fixed-width font and preserving line breaks, such as computer listings etc
an extended quote from some source, shown reformatted and justified, but displayed as special (often indented).Block quotes can have embedded paragraph tags, etc
So much for formats :-)