Critical Mass London: last friday of the month South Bank by National Theatre, 6.30pm

This;

Tracking is the measure of the overall spacing between letters in a
block of text. Tightening or loosening the tracking reduces or enlarges
the space between characters by the same proportional amount for all
characters.

Kerning is the adjustment of the space between two specific charatcers
to compensate for their relative shapes. A lowercase letter set after a
"T" for example will appear too far away if it is not kerned properly
because of all the white space under the crossbar of the "T". Kerning
these two characters closer together restores the more natural spacing
rhythm found among the characters in the rest of the text.