What is indexing ? how does it make search engines work more efficiently?

Does anybody know how to hack into a google account? i had important information on it and it is gone now and i need getting it back.

The database design steps are listed below in the incorrect order. choose the correct order number next to each step. determine the information to be stored in the database. determine the fields needed to record the data determine if there will be any repetition of data entered, and separate the fields into tables to normalize the data. create relationships to connect the tables.

Write an algorithm to check if a number is even or odd and show with flow chart step by step