The difference between Oracle creating a database and creating a user

Popular point to say
First you install Oracle, which is a software in itself, right.

Once Oracle is installed, you can create a database
This is a warehouse, a place to put things.

Then this warehouse (database), there is a warehouse administrator, its name is "instance"

In many cases, a warehouse has only one warehouse administrator.

With warehouse and warehouse administrators.
So this warehouse can store the goods (table, index, etc.)

All the people can go to the warehouse to store the goods.

Of course, register first, that is to create a user

Different users have their own tables, indexes, etc.

These different users put their own tables and indexes in the warehouse.

These different users put their own tables, indexes into or out of the warehouse
Must go through the warehouse administrator and be managed by the warehouse administrator

Just like you go to the bank to withdraw money and save it all by the Ark of the person (instance)
Help you finish

According to your situation, you need to put your data into someone else's database.

Then everyone else's warehouse and warehouse managers already have it.
All you have to do is register with someone (create a user)
Then put your own data (tables, etc.) into their own users can
That these watches belong to you

Just like you go to a bank account, Bank (database) and bank workers (examples) are waiting for you.
You just need to register and deposit your money in your name, but don't deposit it in someone else's name,
That would be a bit of a hassle.