The letter-spacing CSS property sets the horizontal spacing behavior between text characters. This value is added to the natural spacing between characters while rendering the text. Positive values of letter-spacing causes characters to spread farther apart, while negative values of letter-spacing bring characters closer together.
/* Keyword value */
letter-spacing: normal;
/* <length> values */
letter-spacing: 0.3em;
letter-spacing: 3px;
letter-spacing: .3px;
/* Global values */
letter-spacing: inherit;
letter-spacing: initial;
letter-spacing: unset;The word-spacing CSS property sets the length of space between words and between tags.
/* Keyword value */
word-spacing: normal;
/* <length> values */
word-spacing: 3px;
word-spacing: 0.3em;
/* <percentage> values */
word-spacing: 50%;
word-spacing: 200%;
/* Global values */
word-spacing: inherit;
word-spacing: initial;
word-spacing: unset;Sources:
https://developer.mozilla.org/en-US/docs/Web/CSS/letter-spacing
https://developer.mozilla.org/en-US/docs/Web/CSS/word-spacing