What is survey very simple answere

Survey:
     TO collect some basic and important information about the project..

Survey types:
           1).Plane survey
         2).geodetic survey

Survey instrument using in field 

For horizontal distance measurement
 These five instrument can easily find horizontal distance ...
 1)chain
2)Tape
3)steel band
4)level machine
5)total station
6)theodolite

For vertical distance 
1).level machine
2).total station
3).tape 
4).steel band
5).theodolite
















FOR straight line in field
1).ranging rod
2).pegs