As you know Dota has many Hero Combo's,
A Combo means combination of 2 or more heros that are good together,
And they can help their team a lot. Usually on clan wars they pick a Combo,
To ensure a good game. Now lets take some examples of combos :Vengeful Spirit + Traxex
This is one of the best combos , Both of them have great damage, Vengeful has a stun and Trax has slow,
While both have Nearby Friendly Units Damage Aura.
Now this means that both of Venge and Trax will have great damage, A stun and a slow.
So they will easily own their lane, And farm well.Tiny + EarthShaker
This on is obvious , And a great combo,
Tiny Dagger in , Avalanche and Toss,
And Earth Dagger in, Fissure and Ulti (Echo).
Just sit back and watch them all die Blood Seeker + Pudge
Blood Seeker ulti, Pudge hook. GG Techies + Pudge
Techies plant mines , Pudge hooks.Enigma\Treant + Jugger
Enigma or Treant ulti and Jugger level 1 and Ulti.Rhasta + Ursa\Balanar\Barathrum\Troll\Void etc.
Rhasta does the catch level and High Damage Heros do their job Rhasta + Lion
Gayest Combo in Dota, They are the hardest disable heros.Pudge + Barathrum
I love this combo, Barathrum charges and Pudge does ulti.Void + Clinkz\Sniper\Mirana or any other Range\Carry hero.
Void does ulti, Range heros with damage will have enough time to kill.
Thats all for now, You can share other Combos with us if you know any.Regards,