Technical indicators and line studies are built into the terminal for analytical purposes. These objects are imposed directly into the chart and allow to forecast further price changes. At that, indicators are imposed automatically, and line studies are attached manually. This is why, when working with line studies, one has to draw them properly. Parameters of indicators can be set up manually, as well. Technical indicators can have different settings for different symbols or periods.
The use of technical indicators and line studies allows to open and close reasonable trade positions, place and modify pending orders. Moreover, using of analytical means allows to perform systematic trading activities and reduces in that way the influence of human emotions. Along with technical indicators, custom indicators written in MetaQuotes Language 4 (MQL 4) can be used for analytical purposes. No line studies or similar tools can be written in MQL 4.