Application.dataPath

Contains the path to the game data folder (Read Only).

The value depends on which platform you are running on:

Unity Editor:	<path tp project folder>/Assets
Mac player:	<path to player app bundle>/Contents
iPhone player:	<path to player app bundle>/<AppName.app>/Data
Win player:	<path to executablename_Data folder>
Web player (or Dashboard widget):	The absolute url to the player data file folder (without the actual data file name)

Note that the string returned on a PC will use a forward slash as a folder separator.

JavaScripts

// print the path to the data folder
print (Application.dataPath);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
print(Application.dataPath);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
print(Application.dataPath)