What does Aspects mean ??!

Whenever I do my Chart it says something about aspects and please someone tell me what exactly do they mean, here are mine!.

Aspects

Sun Conjunction Mercury 3!.26 472
Sun Opposition Uranus 0!.21 -250
Sun Opposition Neptune 0!.47 -219
Sun Trine Pluto 2!.20 117
Sun Sextile Ascendant 3!.38 19
Moon Sextile Saturn 1!.36 303
Moon Square Midheaven 1!.11 -94
Mercury Opposition Uranus 3!.47 -128
Mercury Opposition Neptune 4!.13 -106
Mercury Trine Pluto 1!.06 116
Mercury Opposition Midheaven 8!.18 -12
Venus Square Mars 3!.60 -43
Venus Trine Jupiter 0!.16 116
Venus Trine Midheaven 5!.14 24
Mars Trine Ascendant 5!.24 19
Jupiter Trine Midheaven 4!.57 19
Uranus Conjunction Neptune 0!.26 191
Uranus Sextile Pluto 2!.41 40
Uranus Trine Ascendant 3!.17 18
Neptune Sextile Pluto 3!.07 20
Neptune Trine Ascendant 2!.51 13
Pluto Opposition Ascendant 5!.58 -10
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