Indicators are tools with the predefined analysis and set of algorithms, this can be applied on the trend to get the indication of price movement. It can be used as supporting tool to confirm the analysis derived from the technical analysis. But the indicators does not work in all scenarios, some of them work for trending and some of them indicate well in non trending zone.
Tech indicators are formed by purely numbers with out taking into account of any data which are basically required for fundamental/ technical analysis
Hence technical indicators can ONLY be used as a SECONDARY TOOL along with the primary tools of technical analysis
However technical analysis packed by technical indicators will ENHANCE the chance of success much more