Tings are collectible items found in all of the first generation Rayman games.
In Rayman and its spin-offs
If Rayman picks up one hundred of them, he gains an extra life, but they can also be used to pay the Magician (who'll give you access to bonus stages).
But careful! When Rayman dies, he loses all of the Tings he collected.—Manual, Rayman
In the original Rayman game, Tings are small blue crystal balls found scattered in large numbers throughout almost every level, often leading Rayman to a hidden cage or to safety. Collecting a hundred Tings gets Rayman a bonus life and resets his Ting count to zero. In the Nintendo DSi-Ware version, only 50 Tings are required for a new life. If Rayman loses a life, he also loses all Tings he is currently holding, except in the Game Boy Advance and Nintendo DSi-Ware versions. They can also be used to open up bonus levels, 10 is enough to pay the the Magician and enter one of his bonus levels. There are 2143 of them in the original version of the game and 1960 in the PlayStation version.
In Rayman Junior, Betilla the Fairy and the Magician refer to Tings as “Bubbles”. Only 50 needed to gain an extra life, however, this is the only way to get more of them. There are 2273 of them. Some Tings cannot be collected because in some levels throughout the game, wrong answers are related to them.
In Rayman Designer, there are Tings of various colours; collecting all Tings of a specific colour will trigger events if they are connected to either a Ting Gendoor or a Ting Killdoor. There are total of 2400 blue Tings - 100 in each level - and if all have been collected, the exit will open up. Five of them - purple, green, bronze, silver and gold - are used to open up passages, while red Tings are used to reveal a few extra lives.
In the Game Boy Color version of Rayman, Tings play a much larger role in the story. Here they are revealed to be tiny fairies inside glassy spheres. These Tings wake Rayman up from his slumber at the beginning of the game to warn him of Mr Dark's plot, and continue to provide instruction throughout the duration of Rayman's adventure. They also grant him new powers at certain points in the game, essentially taking on the role Betilla the Fairy played in the original version. Only thirty Tings are needed to gain an extra life here, and none are required to enter a bonus level. There are only 1184 Tings in this version of the game.
In the cancelled 2D prototype version of Rayman 2, Tings are silvery and metallic; they reflect the colour of their surroundings. Tings are much rarer here, and only ten are required to earn an extra life.