What is the best database system for web and Android ?

Question

I am actually new to database and do not have much knowledge. Thanks if you could enlighten me.

Answer 1

BerkeleyDB Android, iOS
Couchbase Lite Android, iOS
LevelDB Android, iOS
SQLite Android, iOS, Windows Phone, Blackberry
UnQLite Android, iOS, Windows Phone
for more:
https://www.developereconomics.com/five-popular-databases-for-mobile
https://www.quora.com/Which-database-should-I-use-for-building-my-web-and-mobile-app