Taplands is the nickname for lands that produce multiple colors of mana and generally enter the battlefield tapped during some point in the game and have no additional drawbacks, though mechanics to have these lands enter the battlefield untapped may be present. This is the most common drawback given to lands, thus a multitude of cycles of such lands was created over the course of several years. Strangely enough however, such lands were considered "too good" for a long time, until Randy Buehler suggested them during one of his first development meetings for Invasion after joining R&D.
Many taplands have the ability to circumvent the drawback to enter the battlefield tapped; those are:
These taplands simply enter the battlefield tapped. They have no further effects or drawbacks.
In Oath of the Gatewatch the above cycle was functionally reprinted.
- Meandering River (/)
- Submerged Boneyard (/)
- Cinder Barrens (/)
- Timber Gorge (/)
- Tranquil Expanse (/)
Return to Ravnica block included a new cycle of taplands, one for each guild colors combination. Those new dual lands function like the Invasion taplands, except the addition of the Gate subtype on them which is used in reference in some cards of the block for additional effects. Rather than five lands, this mega cycle included ten cards. 
These are taplands that have an upside when entering the battlefield.
Zendikar includes taplands that have the upside of providing 1 life when entering the battlefield.
Lorwyn set included taplands through the hideaway mechanic. That mechanic is some sort of upside, because is like doing Impulse but exiling the chosen card face down. Then you may play the exiled card through the conditional ability, thus the land is also an utility land.
Taplands that have no ETB effects, but have other static abilities.
With a few exceptions all sac lands are taplands.
Manlands which produce any form of colored mana are also taplands.
- Randy Buehler. (August 02, 2002.) "Tending the Land", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Mark Rosewater. (Monday, September 17, 2012.) "Return on Investment, part 3", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Blake Rasmussen. (September 5, 2014.) "The Khans of Tarkir Tri-Lands", magicthegathering.com, Wizards of the Coast.
- Erik Lauer. (September 8, 2014.) "Developing Khans", magicthegathering.com, Wizards of the Coast.
- Blake Rasmussen. (December 24, 2014 .) "A Fetching Look at Fate Reforged", magicthegathering.com, Wizards of the Coast.
- Tom LaPille. (January 29, 2010.) "A Brief History of Tap Lands", Daily MTG, magicthegathering.com, Wizards of the Coast.