i-adjective
Describes a large number or amount of something. Used for countable and uncountable things. Often appears in patterns like ～が多い or 多く～.
この町には外国人が多い。
There are many foreigners in this town.
We had a lot of rain this year.
i-adjective
Used for events or situations that happen often. Common in phrases like ～ことが多い.
休みの日は家で本を読むことが多い。
On my days off, I often read books at home.