Datacrons are speard around the planets of SWTOR. The majority of them are hidden, or are difficult to get to and require you to figure out the proper path to reach them. Upon finding them, each will give a permanent buff to a stat like Strenght or Aim, or give you a Matrix Shard.
There are a limited number of datacrons on each planet. On the starter planets Tython, Ord Mantell, Hutta, and Korriban there are only 3. On all other planets there are 5. Some will only be accessible by either Republic or Empire, but not both. Each of them may not give a large benefit individually, but the cumulative effect on your stats is large. Thus it is highly advisable to find them as you explore the planets.
Matrix Shard Relics
When you get Datacrons, some of them sill give you a Matrix Shard. These Matrix Shards can be combined to create relics. Relics are items you can equip for additional states. To create a relic you need to visit the Assembler.
Empire - Dromund Kaas: In a cave on the left along the path to the Dark Temple at -1782, 557.
Republic - Coruscant: The Lost Assembly Vault in the west room of the Jedi Temple at -3040, 2818. Its on your right as you come out of the elevator.
Matrix Shard Dissasembly
To disassemble a relic you will need a Reconstructed Disassembler Core. These can be purchased from a vendor for 8,000 credits. These vendors are located at:
Empire - From a vendor named Pitkth on Tatooine, in Mos Ila at 626, 2781 west of the Mos Ila taxi point.
Republic - From a vendor named Kitpth on Tatooine, near the sandcrawler north of Anchorhead at 2123, -4070.
R = Red
Y = Yellow
G = Green
B = Blue
Tier 2 – Level 15:
RBY - 18 Strength, 8 Endurance
BYG - 11 Strength, 14 Endurance
RBG - 18 Aim, 8 Endurance
RYG - 8 Endurance, 18 Will
Tier 3 – Level 24:
RYY - 19 Strength, 24 Endurance
BYY - 19 Aim, 24 Endurance
GYY - 28 Cunning, 14 Endurance
RBB - 19 Will, 24 Endurance
YBB - 19 Strength, 24 Endurance
GBB - 28 Aim, 14 Endurance
Tier 4 – Level 32:
YRR - 14 Strength, 33 Endurance, 8 Accuracy, 10 Defense
BRR - 33 Endurance, 29 Will
GRR - 23 Aim, 26 Endurance, 16 Power
RGG - 26 Endurance, 23 Cunning, 16 Critical
YGG - Bugged, gives YRR
BGG - 14 Aim, 33 Endurance, 8 Shield, 10 Defense
Tier 7 – Level 50:
YYY - 52 strength, 60 endurance, 18 Defense
GGG - 58 Strength, 50 Endurance, 24 Critical Rating
RRR - 58 Will, 50 Endurance, 24 Critical
BBB - 50 Aim, 43 Endurance, 26 Accuracy, 18 Critical (Possibly bugged since force users have no use for Aim)
YYY - 52 Aim, 60 Endurance, 18 Defence Rating
GGG - 50 Strength, 43 Endurance, 18 Critical, 26 Surge (Also possibly bugged)
RRR - 48 End, 72 Cunning, 7 Critical
BBB - 58 Aim, 50 Endurance, 24 Critical