age_gender_bkts.csv
Columns: age_bucket,country_destination,gender,population_in_thousands,year

age_bucket: Ranges from 0-100 (literally ranges ex: 90-94) and 100+
country_destination: Two letter country code out of ['AU', 'CA', 'DE', 'ES', 'FR', 'GB', 'IT', 'NL', 'PT', 'US']
gender: male or female or unknown
population_in_thousands: float
year: float

countries.csv
Columns: country_destination, lat_destination, lng_destination, distance_km, destination_km2, destination_language, language_levenshtein_distance
country_destination: Two letter country code
lat_destination: float
lng_destination: float
distance_km: float
destination_km2: float
destination_language: 3 letter code ['eng', 'deu', 'spa', 'fra', etc.]
language_levenshtein_distance: float

sample_submission_NDF.csv (This is what the output should look like)
Columns: id, country
id: user id, string
country: most probably country they will vist (country code)

session.csv
Column: user_id, action, action_type, action_detail, device_type, secs_elapsed
user_id: string
action: string ['lookup', 'search_results', 'index', etc.]
action_type: nullable string ['click', 'data', etc.]
action_detail: nullable string. Either a description of the action or maybe a function name? unsure
device_type: string
secs_elapsed: float

test_users.csv
Column: id, date_account_created, timestamp_first_active, date_first_booking, gender, age, signup_method, signup_flow, language, affiliate_channel, affiliate_provider, first_affiliate_tracked, signup_app, first_device_type, first_browser