# Definitions

## Duolingo
The name of the product and the company that makes it. In print, the first letter is always capitalized, never "duolingo."

## Duolingo Plus
Duolingo's premium plan. A subscription helps Duolingo continue to provide free language learning to everyone. Plus includes helpful features like downloadable courses to learn offline, unlimited hearts, and no ads or interruptions.

## Download
The primary action we want prospective learners to take.

## Learners
People who use Duolingo. We never say "users."

## Courses
Courses are the core of the Duolingo learning experience, teaching a language from the learner's native language. Duolingo currently offers courses in 35+ languages. Learners can take as many as they want.

## Skills
Courses are separated into sections called skills. Each skill is centered around a situation (like traveling) or a part of the language (like common phrases). Each skill covers about 30 new words and a few grammatical concepts.

## Levels
Each skill has several levels. Each level focuses on teaching words and grammatical concepts in a specific context such as reading, listening, or writing.

## Lessons
Skills are made up of lessons. Each lesson teaches a bite-sized chunk of the words and grammatical concepts in the skill.

## Exercises
Each lesson contains about 10 exercises that let learners practice what they're learning in different ways, like translating, speaking, listening, and matching.

## XP
XP stands for experience points. It's the primary currency on Duolingo. You earn XP, not points.

## Streak
A streak is the number of days in a row that you've reached your XP goal.

## Stories
Stories deepen language learning through mini-stories that challenge reading and listening comprehension.

## Podcasts
Duolingo podcasts tell real stories that inspire listeners while deepening their language learning. Each podcast features storytelling in the learning language and narration in the listener's native language.

## Duolingo English Test
The Duolingo English Test is an on-demand English proficiency assessment. The 45 minute test combines questions, a video interview, and a writing sample to fully examine the test taker's English proficiency. Test results are certified within 48 hours and can be shared with an unlimited number of institutions.

## Duolingo Events
Duolingo Events are a casual way to practice languages in person with your local community.

Feel free to use these definitions in copy. Or just use them as a reference for yourself.

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# Words to use

## Like this
- okay
- Okay, email sent!

## Not this
- Ok
- o.k.
- OK
- O.K.

## Like this
- website
- Visit the Duolingo website.

## Not this
- Web site

## Like this
- internet
- The best way to learn a language on the internet.

## Not this
- Internet

## Like this
- log in, log out, sign up (as verbs)
- Log in to continue learning.

## Not this
- login, sign out

## Like this
- login (as a noun or adjective)
- What is your login? What are your login credentials?

## Not this
- log in

## Like this
- anytime
- The English proficiency test you can take anytime, anywhere.

## Not this
- any time

Some words have multiple spellings. Some spellings are just hard to remember. Here's how Duolingo treats these words.

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# Words to avoid

## Users
Externally, we call them "learners." Expressions like "user testing" are okay to use internally.

## Challenges
We call them "exercises."

## Tree
This is our internal term for the layout of the skills in a course. Instead of writing "As you move down the tree," write "As you progress down the course" or "As you complete skills in a course," etc.  
There are a few phrases that are okay to use internally but not in any user-facing communications.

All good.